I have a 2006 expedition that is losing OD. With OD off gears 1-3 shift fine. Neutrals out in OD. I have check OD servo snap ring, check *****, and valves in valve body. OD servo is connected to OD band. Problem just started out of the blue. No slipping prior to. I have heard the combo shift solenoid located on valve body could also cause this issue. Has anyone ran into this? Thanks in advance.

Kevin