Thanks - I've done everything on that list, including tightening the chain (it had some slack in it causing it to droop). The Torsion spring is only about five years old...little by little I've replaced everything (including the garage door) over the years, with the exception of just completely...
I have rebuilt, or, replaced the gears inside my 15+ year old garage door opener. The gears are plastic and get worn down. It was a cheap fix and the parts were avaliable at a local store that specializes in DYI appliance repairs - not only do they carry the parts, but they also have sheets of...