As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING SMELL OBSERVED IN FLIGHTDECK DISSIPATED AFTER TURNING OFF PACK 1. INSP PACK 1 AND FOUND ALL 4 DUCTS ON THE DUAL TEMP CONTROL VLV TO BE MELTED AND LEAKING AIR. RAN PACK 2 ONLY FOR 15 MIN WITH NO BURNING SMELL NOTED SEE LP 288484 SEQ 1 FOR PACK 1 W/U