OP

Quoted from NYP:

Good info, thanks for the replies. I asked because I had a problem with my garage door opening all by itself. It was intermittent and driving me crazy, not a comforting feeling knowing you slept all night with the garage door wide open and anyone could have walked right into my home. The liftmaster company had no idea what it was of course. One day it happened and I heard clicking from the button, took it off the wall, opened it up and saw what you see in the pictures. After threatening to sue their tech called me and admitted they were aware of the leaking caps and have since redesigned the button, but after sending me new wall buttons I realized they really didn't. Was thinking about replacing the caps myself, not sure yet. Funny how your experience fixing pinball machines comes in handy with other stuff....