TAC Incorrect Diag!

Latest issue with a TAC Diag: Installed a PCM on a vehicle it did not fix the vehicle; service calls TAC they tell him to put in a BCM, that doesn't fix the vehicle they tell him to put in a shifter base; base doesn't fix the vehicle either. Turns out the original PCM was defective so now we are stuck with the BCM and base.
I understand a defective part is nobody's fault but this is just my latest case with a TAC issue.
I can't tell you how many times TAC told a tech to put a part in a vehicle and it did not fix the vehicle then we are stuck with the part here.
We should not have to put parts in stock that TAC does not diag properly.

I understand a defective part is nobody's fault but this is just my latest case with a TAC issue.
I can't tell you how many times TAC told a tech to put a part in a vehicle and it did not fix the vehicle then we are stuck with the part here.
We should not have to put parts in stock that TAC does not diag properly.
