What was found
SHORTLY AFTER APU SHUTDOWN, AFT LOWER CARGO SMOKE ILLUMINATED, BOTTLE NR 1 DISCHARGED, (JUST BEFORE BOTTLE NR 1 DISCHARGED, TUG DRIVER CONFIRMED SMOKE AROUND BELLY OF ACFT) SUBSEQUENTLY FORWARD LOWER CARGO SMOKE LIGHT ILLUMINATED, THEN DISCHARGED BOTTLE NR 2. ACCOMPLISHED THE EMERGENCY EVAC CK LIST AND EGRESSED. OPENED SHROUDS AT EITHER END AND GVI FOR OBVIOUS CAUSES, CONDITION AND SECURITY OF 'B' NUTS, WIRING AND COMPONENTS. FOUND OIL TANK QTY OVER SERVICED - DRAINED TO NORMAL. APU FUEL VLV OPS CHK GOOD. MOTORED APU -NORMAL ROTATION IAW JRH STARTED APU, NOTING STONG IGN, NORMAL ACCEL TIME AND EGT. OPERATED BLEED LOADS - OK. ELEC OK. AFTER 40 MIN RUN W/ NO ABNORMAL NOISES SHUTDOWN NOTING SMOOTH COASTDOWN. NO SMOKE FROM EXH AT ANY TIME. DRAINED MORE OIL FROM TANK APX 3/4 QT. TOTAL. GIVEN HISTORY SUSPECT OIL TANK OVERSERVICE CAUSED OIL RETURN TO 'CHOKE', W/ TANK VENTING INTO EXH. CLOSED