Off button does not beep. Off button does not work.
Bought part AP3851195 (Switch, membrane) from appliancepartspros.com
Needed to remove about 8 screws from underside of top panel after opening oven door.
Maybe because of time or frozen grease, I could not remove the panel, but was able to swing it up and replace the membrane switch from below. It took about 1 hour but really there is nothing to it. Remove screws, replace switch. Used scotch tape to hold plastic insulator after it fell down behind the membrane.
Off button works after replacement of membrane.