As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT T313/13, FLIGHT ATTENDANTS SMELLED AND SAW SMOKE IN CABIN. FIRST OFFICER REPORTED ODOR LIKE BURNING CLOTHING. RETURNED AND LANDED WITHOUT INCIDENT. ACCOMPLISHED PACK BURNOUT IAW MCM CARD 21 92 12 AND ACCOMPLISHED WORK CARD 21 96 01. FOUND APU LOW ON OIL AND LEAKING. REPLACED O-RING ON OIL TANK DRAIN. NO FURTHER LEAKS NOTED. SYSTEM GROUND CHECKED NORMAL OPERATION. (CLOSED)