Agree with the posts above that Toyota needs to cover their own rears.

The "legal" way for you to avoid this is to tell them when you drop off the car "please do not check the tire pressure, they are set the way I want". They will note your request on your work order, and thus you have waived any liability regarding the tires because you specifically told them not to check it. But you definitely can't tell them to set the pressure at a non-factory specified pressure and expect them to comply.

CAMRHEE Hybrid - FOR SALE!!!!
Completed Mods: RK-Sport body kit, 18" LexusGS430 wheels 235/50ZR18 tires, TRD/SE springs, Rear Lip Spoiler, Terk XM-Direct, Smoked tail lights, Sliding Armrest, Rear Bumper Applique, Front License Bracket, Lower Grill chrome inserts, K&N, Blaupunkt THB200A sub, moved rear HSD emblem
Future Mods: fog lights, black chrome my wheels

http://www.greenhybrid.com/share/fil...fterFront4.JPG