05 pathfinder,there is like a plastic piece in there that happened to become damaged as I feverishly tried to lower the spare and I couldn't take the t-bar out so I sawed it off

I had the same issue on my 2006 pathfinder and found this solution to be incorrect. It is not the secondary lock. There is a piece of plastic tubing that guides the rod down towards the lowering winch, however it doesn't go all the way to it. The rod has become wedged between the lowering winch and this piece of plastic. You can get it free but it will take patience and some twisting and pulling. Once you do get it free try again to drop the tire and when you succeed cut back the plastic tubing so this doesn't happen again.

you open boot remove tool bag and there is a long handle that slots into the bumper that goes right to into spare wheel and lowers it look at top rim of rear fender see the slot or hole i was caught out too hahha good luck

If those are fuel lines then fuel would be coming out. There are lines that carry fuel vapor for the EVAP system. If these lines you are looking at are the EVAP lines (sounds like they are) then this would be the cause of the large EVAP leak.

Open the rear hatch, insert the long jack handle into the small opening and crank the handle counter-clockwise to lower the spare.

Open the back hatch, insert the long jack handle into the small opening and turn the handle counter-clockwise to lower the spare tire.

Never tried it but found this on the internet:
If you have turned the crank to lower the tire and nothing happens STOP. I did this and borke the plastic that covers the coil of wire! Get out another jack and jack up the center of the spare. It has a safety on it that will lock the spare in the event of a cord failure. Jacking up the center of the spare tire will release it. Just make sure your no where near it if it falls off the jack. Good luck I hope this helps. Oh and if this doesn't work right away STOP JACKING IT UP!!!!
http://wiki.answers.com/Q/You_are_not_able_to_lower_the_spare_tire_in_your_2003_envoy_slt_The_instructions_do_not_seem_to_help_Suggestions

try and disconnect the pos battery cable for a bout 10 minutes and see if this resets it make sure you have radio code in case ur radio locks

locate bolt or wing nut in centre of wheel and undo

See this link for instructions:

http://www.nissanforums.com/pathfinder/138735-99-pathfinder-spare-tire-removal-help.html

The window came off of the track. This happens when the plastic anchors that hold the window to the track assembly/scissor break. You will need to disassemble the door panel, retrieve the window (lift it into position), and install new plastic anchors onto the window and into the track. Your dealership will sell you a new set for 5 to 10 dollars.