I have an old Craftsman chain-drive garage door opener. It was there when I bought the house, it's gotta be at least 20 years old, but it works well (noisy as all get out). Anyhow, there are light bulb sockets on both sides of it. The light bulbs are supposed to come on when the door is being opened or closed. They used to work. Now, they come on for a couple seconds, then go off, then flicker a bit, then come on, then go out, etc. I jiggled the bulbs in the sockets a bit and they stayed on for a while, but then resume the erratic performance. One might guess that the bulbs might be coming loose in the socket from the movement of the garage door, but that is not the case. The bulbs remain snugly in the socket. In fact, they work a little better (i.e. stay on a little longer before starting the off-on stuff) if I unscrew them slightly.
Thanks for any advice....oh, I don't want to replace the opener, so please don't suggest that!
Mike