Too bad that you've had a few problems here. Sounds like the taillights really are not that bad, but I'm not even sure what ptu is. I even Google searched it first.
Make sure to let us know when you receive these new parts. Crossing my fingers that everything works out for ya.
PTU is the power take off unit. Doesn't seem ultra serious but more annoying. The worse case scenario is that the fluid would be leaking too much and there wouldn't be any lubrication for the moving parts, thus causing unneeded wear and tear.
Some people have stated that they notice puddles of fluid. I haven't noticed liquid but rather the harsh gasoline smell.