As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SMOKE IN AFT CABIN. PERFORMED TSM 05-50-00-810-831-19, FOUND APU OVERSERVICED IAW TSM 49-00-81-810-874-A. DRAINED AND SERVICED. REMOVED, INSPECTED APU BLEED DUCT ELBOW AND LOAD CONTROL VALVE IAW TSM 49-00-81--810-874-A, NO CONTAMINATION NOTED. PERFORMED PRECONDITIONS WITH APU IAW AMM 12-33-21-618-001-A02. NO SMOKE NOTED. AIRCRAFT RETURNED TO SERVICE.