Several knobs (as described) came loose. They look OK (as I stated) but don't produce any changes of actions. 'Stripping' does not apply. The only controls I can activate (as I stated) is the bake button -- not with the button but with a screwdriver. I can then set the bake temperature with the turn knob. None of the other buttons let me do this.
The suggestion was useless, and I resent your having charged me $45 for advice that did not solve the problem