Upon arrival my concern was that the upstairs was blowing air while the downstairs only calling for Heat. Went into the attic and found no issues with zone motor. System operational, take 45 seconds to close damper completely. Tested zone board, sending 30.8v to damper motor, can damage zone motors. Operation Voltage should be around 27.5A max. Zone Board will need to be replaced in future. Showed homeowner. Recommendations New HVAC due to conditions, age and efficiency