1995 buick lesabre computer

am haveing transmition looked at, but the car has some other codes for the computer, hopeing maybe they all are related. the place i bought it from said they have replaced both computers in the vehicle with new ones, but the computer i used at advance shows 3 trouble codes. we have cleared the codes out, ut they have come right back. first is a ESC Failure, second is a Quad Driver Module 2 Fault, and a F31 Transmition Solenoid Failure. am haveing transmition looked at now, but not sure were the Quad Driver is, can someone tell me were that is at and were i can find information about it? the ESC Failure i am not understanding either, the car runs fine. Just woundering with the rest of the story here is anyone might be able to give me a little insight on whats going on. i am a shade tree Mechanice so computer stuff is kind of new to me, u catch on quick, but am just in the learning procces now, any help is Appercated..

The tcc problem can cause a quad driver code in the pcm ,as this is what controls the tcc solenoid, get that fixed first and the rest may clear up.The quad is in the pcm ,it is like a heavy duty switch for high load relays and solenoids.