Electronic Diagnostics w/ Programmer still on truck?
 

I need to take my truck in for a electrical diagnostics cause I have a random TCM code that pops up. Thats not what is striking me strange. I have my PPE on the truck and when I asked if I should remove it and go to stock, the dealer said to leave it on. I thought normally they like that stuff off and back to stock. Is this normal? Any thoughts? thanks.