Originally, replaced the door open/close motor thinking it was failing, but after a while ice chute door started to not fully open again. That left only two other failure modes - - signal pulse duration from control board, or the convoluted plastic link, lever, and cap assembly shaft binding/bending. Replaced them all. Since then operating correctly - - no further issues. It is possible the plastic levers and/or door cap shaft was binding, or bending, not allowing the cap to fully open. For good measure, I also replaced the Actuator Lever since I was opening up the ice/water dispenser door front anyway.
Appliance Parts Pro was very easy to order from, and they even rapidly resent a part that was damaged in transit. Will do business with them again...very professional and helpful.