What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTED VERY STRONG (WET SOCK ODOR) AT RDU, ON CLIMB OUT, AND DECENT. DURING CRUISE, WENT AWAY. MAINTENANCE ACCOMPLISHED APU LEAK INSPECTION PER AMM 49-10-00 AND FOUND OIL SCATTERED. MAINTENANCE REPLACED OIL COOLING FAN PER MM 49-52-51.