Replaced condenser fan motor (and while I was at it decided to replace the fan itself and the two grommets on either side of the motor spindle, one of which DID look somewhat worn when I examined the old one. Anyway, so far so good. Fridge is keeping good temp, fan seems to run when it needs to, no more noise. It's been 3 or 4 days so far...In all, an easy fix (under a half hour) and about $85 in parts with shipping.