Whirlpool OTR Microwave Turns On or Off by Itself

This control board came from a microwave that would occasionally turn itself on by itself.  I don’t think the mag was actually firing, but the fan was coming on.  It would also occasionally make a high pitched electronic whining sound. Traced it to the control board.  This is the old control board – check out the corrosion on the back.  Never heard back, so it definitely fixed the problem.