Code 757 i dont have my cheat sheet here at work with me. But from the looks of it sounds to me like it may be time for a new Valve/Solenoid body. Or else you could just replace the solenoids.. Im not one to usually mess with a tranny however, i tend to replace them.
I have a code 757 on my 2004 silverado. I suspect it is a shift solenoid. Any thoughts