As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN INFLIGHT T1055/23JUN. CREW REPORTED ODOR AND HAZE IN CABIN. RETURNED TO DEN AND LANDED WITHOUT INCIDENT. NO EVIDENCE OF FIRE FOUND. REPLACED RT AIR CONDITIONING PILOT PRESSURE REGULATOR AND ACCOMPLISHED PACK BURN. SYSTEM GROUND CHECKED NORMAL OPERATION. (A)