As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 495 LAS-PHX - FUMES - TOXIC SMELL OF BURNT PLASTIC COMING FROM CABIN / COCKPIT AIR CONDITIONING BLEEDS. TURNING OFF NR 1 PACK SEEMS TO CLEAR ODOR OUT. MAINTENANCE FOUND NR 1 ENGINE TO BE THE SOURCE OF THE ODOR. REMOVED AND REPLACED NR 1 ENGINE. VENDOR TEARDOWN INDICATES NR 3 CARBON SEAL WORN BEYOND LIMITS.