Water leak on back side of jet

How severe is the leak?
Is the water level dropping when the tub is not in use? If so you will need inspect the back (inside the tub) portion of each jet. There is a gasket and nut on the backside of each jet body, these may come loose for crack.
If your leak is only when you have the pump running, your leak could be on the suction or discharge side of the pump. Only leaking when there is water pressure.
A temporary fix is Fix-A-Leak - a water treatment that will temporarily repair any crack up to 1/8". Its no guarantee but might help.

I would first check that the suction intake has no obstructions. The next thing is to make sure that the jets are not pointed at the suction intake, there could be air getting into the system. You also need to make sure you have adequate water level.

make sure you have power to outlet that motor is plugged into,if so try pushing jet button in tub about ten times in a row quickly then on tenth push use as much force as possible and hold.if this does not work,air hose from back of button to pump motor may be disconnected.

If there is a  threaded nut on the back of the jet, undo the nut as much as possible and push the jet out into the tub. Spread aquarium grade silicone around the jet and push back into the hole, put more silicone in front of the nut, you may have to spread it in the small area with your finger or if you can squirt it in from the tube of silicone. If there is no  threaded ring on the backside of the jet, go to the jet in the tub and looking down on the jet, turn it to the right. It should pop and pull out of the housing. There will be a retaining ring that may require a special tool to remove it, once the ring is out, clean it very well, spread silicon on the threads and the lip. Reinstall in the hole, reinstall jet wait 24 hours and fill and test for leaks. Take you time and you will not have to do it over again. Check where the leak is coming from, sometimes there is a hairline crack in the jet assembly, if this is the case, make sure the area is dry then use a 2 part epoxy for plastic (from lowes or home depot) and smear this all over and around the crack, let dry 24 hours, fill and test.

The air coming from the blower will be cool, but should not be cold. Turn on the blower or bubbler feature (no water necessary) and go to the access panel ( as specified by install instructions), reach in and feel the tube connected to the blower, the tube should be warm, if not the heater coil is not working and the blower assembly needs to be replaced.

It is important to examine the leak to see where it probably originates.

If the water is leaking from the right hand side of the door on your dishwasher, it is time to replace the gasket that seals the door when the door is latched.

Sorry, the tub will have to pulled out to find out what is leaking so it can be fixed. There is just no other way UNLESS you can open up the wall on the blind side of the tube. (but its probably and exterior wall...if the house is vinyl sided, it can be done. If brick, you'll have to pull the tub). If you just wanted to convert to a tub only, maybe Bathfitters has an insert solution...