My gut reaction is that one of the control relays on the printed wiring boa rd has a stuck contact. I beat on the relays with the power off and then r econnected the power. It seemed like the door was ok for one period of tra vel during which it closed about half-way, but then it went into the obstru ction mode again and reversed with the flashing light. The printed wiring board is marked 3528, BM01, date code 9615.
The Stanley help center/parts seller is closed until tomorrow when I will p rice a replacement printed wiring board. Anyone have ideas for anything to try in the interim???