As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CARGO DECK SMOKE DETECTOR ACTIVATED WHEN APU BLEED SELECTED ON. SMOKE FILLED MAIN DECK. CLOSED APU BLEED AND SHUTDOWN APU, BATTERIES. FOUND BOTH RELIEF VALVES STUCK OPEN ON BOTH SIDES. REPLACED APU PRESSURE LINE CHECK VALVE IAW MM 29-14-17-04, REPLACED YELLOW RESERVOIR AIR PRESSURE RELIEF VALVE IAW MM 29-14-00-00 & MM 29-11-11-04. DECONTAMINATION CHECK IAW MM21-51-00-03.