So, I just replaced the drive gear in my Craftsman GDO (a 1997 chain model w/ everything wired.) Back up she went and now it moves only maybe 6 inches and then returns to original position. Having examined the sensors, the right one is solid green and the one on the left to NOT blinking but more like a flicker as if a light wasn't getting quite enough power. My main open/close switch is the same effect. If I obstruct the sensors, nothing changes at all. Also, I've read that cold weather can play tricks on the older sensors thou mine has worked all winter till now.

Any ideas? Thank you in advance.