Code error P0751
My vette its a base model 2008 ls3
I have this code error P0751 , so i did a research and its solenoid A stuck off , and as far as i know the solenoids on the 6L80 cannont be replaced so i bought a brand new TCM part number 24275872 and checking the fitment fits my 08 vette so i bought it and a friend of mine (ex GM technician) installed it yesterday and reprogram it with GM software and obviously refill the tranny fluid with Mobil Dexron VI 7 qartz , and after installing the new filter put the pan again and drive it some miles , the error code P0751 came back again. to add more information he removed the valve body and checked the valves springs check valves and everything was in good conditions even the oil was in good shape, but im still getting this code.
and yes actually i feel time to time some miss shifting from 1st to 2nd gear.
any suggestions ? oil level is good and in good shape (is new), new filter , new TCM , reprogramed.
any suggestions will be well accepted








