What was found
AIRCRAFT 3125, THE AIR QUALITY OFF THE PACKS WAS SUBSTANDARD, MUSTY SMELL. IN ADDITION, THE FLIGHT ATTENDANTS REPORTED THAT THE CABIN WAS HOT ALTHOUGH INDICATED TEMP WAS 68F. QRH 2.47 DIRECTED HOT AIR SWITCH OFF. THIS HELPED CABIN TEMP AND ALSO, WE COULD NO LONGER SMELL MUSTY ODOR. AFTER HOT AIR SWITCH OFF, LEFT PACK OUTLET + 35C, AND RIGHT PACK OUTLET TEMP -10. CORRECTIVE ACTION: REPLACED APU LUBE MODULE. (LP 9696766, 9696771)