Well, put in new sensors…no improvement. Rolled the dice and installed OE GM tcm/solenoid unit thinking that could be the only other logical probable issue. Problem solved, tranny working perfect. After I did all of this I read on GM tech subscription which blade on ISS plug is supposed to have voltage from TCM. I’m betting if I had checked that the first time it would have saved me the trouble of having to take apart transmission (and of course everything around it) twice. But at least its done. Anyway, if you get a P07BF code from tranny and its in limp home mode be very suspicious of TCM. Whoever decided to put it inside the transmission where its bathed in searing hot oil has a special place waiting for them in you know where.