My Vertical it's fine, all I need is to move them to center (left and right)
SOURCE: can't adjust 2004 Ford Expedition headlight
I had a similar problem on my 04 expedition. I just bought it and the headlights were aiming too far down. A rather larger gap was noticeable between the headlight and the hood. The so called adjustment bolt did nothing. I removed the headlights and found 2 issues. On the adjustment bolt there is a washer. Make sure when you re-install the headlight the washer sets on top of the plastic slot and is visible when looking down behind the headlight. Without the washer being in the correct location it will not tighten the headlight in place.
Second I found the adjustment bolt adjusted nothing. It merely tightened the headlight in place. What I had to do was to loosen this bolt and physically move the headlight into place and the re-tighten the bolt. Hence the slot is the adjustment. Turning the bolt CW or CCW did not move the headlight.
I tried several things trying to figure why the lights would not move until I realized I could move the light with my hands and tightened them in place using the adjustment bolt.
This may not be your issue but I found the owners manual instructions to be useless.
SOURCE: 2007 Chevy W3500 tiltmaster, headlights- Since
You said that you took it in to the gmc dealer Take the vehicle back and have them show you where the adjustera are in the service drive an advisor can show you how . and then if the headlight is not set in there are not push into the wholes the retainers from the headllights sit in.and yes their are 2 screws torx in general and one is on one side and the other is on the other side of the light the other may below the sight shield. Please rate my response
SOURCE: headlight adjustment
If you look at the front of the headlight, there are actually a couple of screws around the edge. These are your adjustment screws.
SOURCE: Convergence lines are SLANTED. Red line is above
Your TV most likely a convergence failure. ( common problem )
Here are some of the most common symptoms and example photos of a convergence problem
Here are some photos of convergence problems.
Here is a quick test....
Using your original remote go-to the tv settings then goto the convergence section.
Try to adjust the red and then the blue convergence.
You should be able to move them up, down, left, and right.
If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem. 
SOLUTION
You will need to replace the convergence chips and possibly some convergence resistors and pico fuses. Its a fairly easy DIY job or you can call in a pro. If you want to do the repair yourself check the site www.TvRepairKits.com. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.
SOURCE: Headlights
The adjustment screws/nuts should be located either on the top of the headlamp assembly,
behind the headlamp assembly, or near the frame rail by the radiator
support.
You will have vertical adjustment screws for each independent beam
(separate highs and separate lows, but will be same screw if highs and
lows are the same bulb). You may also have additional horizontal
adjustment screws as well
Park
your car on a level ground 30 feet from a wall and measure the height
from the ground to the bulb and mark on a wall (do this for highs beams
and low beams if the bulbs are separate, if highs and lows are the same
bulb, only do it for the lows)
For Low Beams: If the headlights read VOR, then
aim the brightest part or cutoff part just below the mark on the wall.
If it says VOL or nothing, aim them 2 inches below the mark on the wall.
For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.
2. ADJUST HEADLIGHT AIM ONLY
(a) Place the vehicle in the following conditions.
The area around the headlight is not deformed.
The vehicle is parked on a level surface.
Tire inflation pressure is the specified value.
A driver is in the driver's seat and the vehicle is in a state ready for driving (with a tank full).
The vehicle has been bounced several times.
(b) Check the headlight aiming.
(1) Prepare a thick white paper.
(2) Stand the paper perpendicular to the ground at the position 3 m (9.84 ft) away from the headlights
bulb center.
(3) Ensure that the center line of the vehicle and the paper face forms a 90-degree angle as shown
in the illustration.
(4) Draw a horizontal line (H line) on the paper, showing where the headlights should strike.
(5) Draw a vertical line (V line) at the position where the extended center line of the vehicle strikes.
(6) Draw 2 vertical lines (by connecting the low and high beam center marks) to where the both headlights
should strike (V RH and V LH lines).
(7) Draw a horizontal line (by connecting the both low beam center marks) at the position where the
headlights should strike (H RH and H LH lines).
HINT:
The H RH and H LH line is 0.4° below the horizontal line (H line) of the light axis.
(8) Start the engine.
(9) Turn the headlights ON.
(10) Check that the headlights properly strike the position shown in the illustration.
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