Hey guys

-new to the forum. Heres my story
My GF has an 01 tib with an Auto tranny

Lately its been givin her shit...
I fixed her rough idle with some seafoam and a new TB, changed her plugs last week along with some synth oil and a nice filter and installed a new air filter. But
lucky me her car has started acting up and she claims that the car doesnt go into her last gear, there is no check engine light so i am unable to pull the code..
The dealer wants $94 just to "check out the car" for me
So im wondering if anyone knows of a tech. service bulletin about the trans that would give me some weight when approaching the dealer
any help is appreciated
CLIFFS:
-tranny will not shift into last gear (assuming this is OD)
-Dealer doesnt seem helpful
-Need info on warranty, or TSB's for 01 Auto tranny
-Thanks