What was found
DURING THE TAXI, STARTED THE APU TO COOL THE CABIN DOWN, ONCE THE APU BLEED WAS TURNED ON DETECTED A SLIGHT OILY SCENT. AFTER APU WAS SHUTDOWN, SCENT WENT AWAY. FOUND APU OIL OVERSERVICED. DE-SERVICED TO CORRECT LEVEL IAW MM 12-11-03. REMOVED WATER SEPARATOR FOR CLEANING OF SOCK IAW MM 21-51-00 CLEANED WATER SEPARATOR SOCK, IAW MM 12-19-02 (REV 24) INSTALLED WATER SEPARATOR. IAW MM 21-51-00 (REV 22)OPS CK GOOD. LEAK CK GOOD. NO UNUSUAL ODOR NOTED.