As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BAD, FOUL ODOR COMING OUT OF COCKPIT AND CABIN VENTS BOTH ON THE GROUND AND IN FLIGHT. REMOVED APU INLET DUCT ASSY AND INSPECTED AREA. FOUND OIL SEEPING AT COMMPRESSOR INLET HOUSING AND OIL RUNNING DOWN THE BOTTOM OF SAME HOUSING. R & R THE APU IAW MM 49-10-00. APU OPERATES NORNALLY. OPS AND LEAK CHECKED GOOD. NO ABNORMAL ODOR NOTED.