As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE IN CABIN FROM PACKS WHEN FIRST APPLIED FROM APU ON TAKEOFF. NORMAL POWER WITH EGT QUITE HIGH, ABOUT 585 DEG, GOT A BURNING ODOR THAT SET OFF SMOKE DETECTORS IN AFT LAV LASTED ONLY A SHORT TIME. REPLACED APU PERFORMED DUCT BURNOUT AND REPLACED WATER BAGS.