Went on a call about a month ago, gas pack had been through 3 ECM blower motors in 7 years they called us bc the company that changed the motors said they will only warranty the same piece 3 times in the 10 year warranty period, went out and opened the blower compartment door and the 18" flex was completely disconected from unit. How the other tech didn't see this when changing the blower 3 times is beyond me. Fixed the duct and put new motor in and the next day the customer called and asked what we did bc the unit was keeping the house cool and not running all the time like it had. There was not sp on the return duct causing the motor to overamp and burn up the ECM motor. Had it been a psc it would have pulled less amps.