Mine is slowly failing, meaning the buttons don't activate the unit reliably. Been pushing on the edge helps some. So today I decided to try fixing it. This is a dangerous thing for me to do.
Unplugged the unit from the ceiling. Two screws held it into the garage wall. Then a white and a blue thin wire connected it to the wiring. After disconnecting those two wires, and writing down which one went where.. the unit was free.
Next there were eight small screws holding the circuit board in the casing, as well as the two screws that had held the power wires.
After removing the 10 screws the board came free and now I could remove the board and get to the front of the unit. The rubbery cover that has the buttons pulled off easily. There are tiny posts that fit into little holes in the board so it will go back exactly right later.
I found that the circuit board where the up and down buttons pushed had a black rubbery residue where the push button pads made contact. So I very gently wiped that residue off carefully not scratching the board. Got about 70% off with just a paper towel and quit as I didn't want to damage the circuit board. No chemical cleaner, just a touch of water on a paper towel.
Replace parts in reverse order. Attach the two power wires, screw back into the wall and put the plug back in the outlet. And so far, it is working nicely. YMMV
Obviously this is not a permanent solution.
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Men plug the dikes of their most needed beliefs with whatever mud they can find. - Clifford Geertz
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