I have a 1994 RV that has a 4L80E transmission and 6.5 chevy turbo diesel engine. The issue im having is that if its driven cold it shifts perfectly. Once it warms up to normal running temps it stays stuck on 2nd gear. I have replaced fluid and filter, solenoids, speed sensors, and pressure switch. With no luck. I disconnected the TCM and cleaned out plugs and plugged back in and test drove it at normal running temperature and shifted beautiful. Tried to test drive it the next day and it had a delayed and hard shift into 2nd gear and stuck again. Any ideas?