As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON WALK AROUND FOUND OIL DRIPPING FROM APU DRAIN TUBE. GROUNDED - YES. CLEANED OIL FROM APU AND RAN, FOUND OIL LEAKING FROM LUBE FILTER ELEMENT BOWL. REMOVED BOWL AND FOUND BOWL O-RING BAD. INSTALLED NEW OIL FILTER AND PACKING. RAN APU FOR 30 MINUTES NO DEFECTS NOTED. REF B737-800 AMM 49-91-12. OK FOR SERVICE. APU SERVICED TO FULL. RAN APU FOR AN ADDITIONAL HOUR PER ETOPS MANUAL PER 05-00-11.