What was found
WHEN APU WAS STARTED AND APU BLEED TURNED ON, CABIN FILLED WITH SMOKE, TURNED OFF BLEEDS FOUND HYD FLUID RUNNING FROM AFT DRAIN HOLE INTO APU INLET. FOUND REV MOTOR PUMP S/O VALVE M1-165 DRIPPING IN AFT COMPT PN 148995, AIPC 29-12-60-03, FACT 10SEP09 06:58, EWR. FOUND PLUG ON NON REV HYD MOTOR PUMP S/O VALVE LEAKING. REPLACED PACKING ON PLUG. LEAK CK GOOD. REF IPC 29-22-05-05, AND MM 27-26-03-2.