What was found
ON TAXI AFTER LANDING APU GENERATED SMOKE IN THE CABIN; SWITCHING BLEED AIR OFF REDUCED THE SMOKE. MAINTENANCE DISCOVERED THE ACM FROZEN AND A DUCT OVERHEATED TO THE POINT OF DISTORTION AND MELTING. MAINTENANCE REPLACED THE ACM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ON TAXI AFTER LANDING APU GENERATED SMOKE IN THE CABIN; SWITCHING BLEED AIR OFF REDUCED THE SMOKE. MAINTENANCE DISCOVERED THE ACM FROZEN AND A DUCT OVERHEATED TO THE POINT OF DISTORTION AND MELTING. MAINTENANCE REPLACED THE ACM.