I have two outside condensers, 2 zones, and one of the fans appears to be running at half the RPM's of the other fan. Would this indicate a problem with the fan motor? This particular zone does not seem to be cooling as well as the other zone. Looking for some advice before calling the repairman. Thank you in advance!

I would check the fan run capacitor first. A weak capacitor can make the motor run slower than it should.