As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABQ INFLIGHT T1114/25 - AFTER TAKEOFF FLIGHT ATTENDANT REPORTED GREYISH SMOKE THROUGHOUT ENTIRE CABIN. SMELL WAS A HOT SMELL. RETURNED TO ABQ AND LANDED WITHOUT INCIDENT. FOUND APU INLET SOAKED WITH OIL. REMOVED AND REPLACED WATER SEPARATOR COALESCER. CLEANED AND REPLACED BAGS AND ACCOMPLISHED A PACK BURN. SYSTEM GROUND CHECKED NORMAL OPERATION.