its a tsb so if i have problems down the road after the warranty is up it'll still be covered right?
I wish. No. you won't be. The only time they will cover it fully if it were their error. So for instance, they knew they had to replace BOTH and only replaced one. I asked that very same question to the service manager and he said "if the tsb only says replace the bad harness and the other one causes problems later (after warranty), then it'* your problem". That'* when I insisted they replace both.
!But be warned!
They won't "just do it" for you. I had to actually demonstrate the problem in person before they would fix it. That meant taking in a pocket full of bulbs and showing them that even after they replaced the drivers side harness it still blew bulbs. They believed me, I am guessing, because I actually sat there and showed them
that it still blew the bulb. At some point I must have sounded authoritative enough about the wiring because they went ahead and replaced the passenger'* side. Guess what? No problems since. Does this mean they'll believe the next GXP owner with the same problem? HAIL NO.
Another example horrible GM service.