As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX INFLIGHT T1770/28OCT - FLIGHT ATTENDANTS REPORTED BLUE SMOKE OR HAZE IN CABIN AND ODOR NOTED IN COCKPIT. RETURNED TO PHX AND LANDED WITHOUT INCIDENT. FOUND OIL IN APU INLET. ACCOMPLISHED PACK BURN OUT AND REPLACED BOTH COALESCER BAGS. SYSTEM GROUND CHECKED NORMAL OPERATION.