My house, built in 2004, has 2 Lennox Airflow A/C units. The other day the larger unit that runs the upstairs stopped cooling. I made a service call to a local HVAC company. The tech that came out found that the fan motor on the upstairs Airflow unit (Model AFHEAT12B36) wasn't spinning. If you take a screwdriver and just nudge one of the fan blades, the fan will spin up and run just fine. I've done it 3 or 4 times over the past few days and found the motor works fine if you just give the fan a little push to get it started. I bought the house in 2008. The fan motor on the A/C unit in question isn't the factory motor. It's been replaced, but I do not know how long ago. My question - Should I spend $200+ on a new fan motor, or does this one just need maintenance? Thanks in advance for your help!