First off, thanks to those who replied to my gosh awful redundant question. I read and react to all.
I have not solved the issue, but I have confirmed that the spoiler operation is definitely an every other ignition cycle phenomenon. Spoiler will work semi-correctly on one cycle but totally incorrectly on the next. That fact must have some significance.
Of even more interest is the fact that I discovered one of the limit switches had pulled apart and was hanging by its wires. I had no way of telling if all of the switch was there. Nevertheless, I put it back together but it made no difference.
One of you mentioned speed sensors - how can I obtain the correct ones?
Limit switches - how can I obtain those?