As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT TO LAND CREW SMELT (STRANGE ODOR) COMING FROM THE AIR CONDITIONING GASPERS. DEACTIVATING ENVIRONMENT CONTROL UNIT CEASED ODOR. AFTER LANDING INSPECTION MAINTENANCE PERSONNEL DISCOVERED A SPLIT IN THE (INDUCTOR) TUBE BETWEEN THE TEMPERATURE CONTROL UNIT AND THE COOLING TURBINE OF THE ECU. SEALING O-RING (PACKING) OF INDUCTOR AT COOLING TURBINE END HAD DETERIORATED AND STARTED TO COME OUT OF TUBE AT SPLIT.