Customer Issue: The overhead door couldn't close and would open back up each time the Mr. Gruzinkly tried to close it.
Our Solution: Having faced this type of problem numerous times before, we had a "hunch" what the issue was. Sure enough, one of the garage door opener sensors got out of alignment. We checked the wiring to ensure it wasn't damaged. Then, we fixed the position of both sensors to ensure the invisible beam connected them correctly. We then tested the door to ensure it closed without issues and reversed when something interrupted the beam.

Customer Issue: All of a sudden, the garage opener now starts making noises it wouldn't before. And it moves shakily each time.
Our Solution: We began by checking the fasteners and tightening everything. Then, we adjusted the opener chain, which was a bit too lax for optimal function. But as we moved on to inspect the interior of the garage door opener motor, we found that its main drive gear was very worn.  We informed the customer replacement wasn't immediately necessary. However, we also told him, it would be prudent, and the opener will work better with a new gear. He decided to have us replace the motor gear (with a new one we brought along, as we do for every service call). Afterward, we tested the system and it's functionality, to make sure everything was in top shape.