I have a misbehaving garage door opener. It works fine and the remote works fine, but the courtesy lights don't come on any more when you open or close the door.

The opener is a "Beaver" brand, which means it's about 15 years old (I think the brand was a "Stanley" knockoff). It has a twin next to it that's working fine.

The light bulbs in the misbehaving opener are also OK.

I'm not very handy, but I'm thinking that maybe there's a fuse in there that controls the lights that's blown?

Any ideas or help appreciated.