98 Safari OBDII Code PO785

I have a Code PO785 that will not go away. Transmission shifts normally when cool. When the trans warms up I get a hard shift and then only 3rd gear. I can manually shift and get 2nd and 3rd.
Shift solenoids, 1-2 and 3-4 are new. Force motor is new and Pressure Manifold switch is new.
Any ideas?