Most opener calls in this town break down into one of three repairs: the logic board, the drive mechanism (chain, belt, or screw depending on what's installed), or the safety sensors at the base of the track. We test the wall control and remote signal first, then check voltage at the motor before opening the housing - no point pulling a cover on a unit that's actually a wiring problem.
Houses here were mostly built around 1976, and a chunk of the openers we find on service calls are second or third replacements for that original garage - meaning circuit boards from several different eras of opener design, some with sensor wiring that doesn't match today's standard and needs an adapter or a rewire to bring up to current safety code. We carry common logic boards and sensor kits on the truck; anything obsolete gets ordered, and we tell you that up front rather than mid-job.