As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABQ - FLT 498 - AFTER TAKEOFF AT 5000 AGL, FLIGHT ATTENDANT IN AFT CABIN REPORTED BLUE SMOKE AND OILY SMELL IN AFT CABIN UP TO MID CABIN AREA. RETURNED AND LANDED ABQ WITHOUT INCIDENT. SOME SMOKE WAS SEEN COMING FROM NR 4 WHEEL AREA AT GATE. REPLACED AUXILLARY POWER UNIT. SYSTEM GROUND CHECK NORMAL OPERATION. (M)