How to reprogramming a Craftsman garage door opener / remotes?
The opener is a Craftsman 1/2 HP 41A5021-3E and the remotes are 139.18076.
Our door was opened up overnight so I'm assuming someone else in the neighborhood has a unit operating on a similar code. I've reprogrammed other units in the past, but this system came with the house and I don't have a manual.
It says on it that I can clear the codes on the remotes and program them in again... but I'm wondering how to actually change the codes/frequencies that it's currently operating on again so we don't have a security issue.