As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2141, BOS-LGA - DURING FLIGHT F/A SMELLED A TORCHED CLOTH BURNING SMELL IN FWD CABIN. CREW ALSO REPORTED NOISE FROM AC LEFT AFT OF FLIGHT CREW. AC RELEASED ON MEL. MAINTENANCE VERIFIED NOISE AND SMELL COMING FROM LEFT PACK SYSTEM. FOUND AIR DUCT NEAR FLOOR ON AC LEFT LOOSE, MISALIGNED. REALIGNED AIR DUCT AS REQUIRED. OPERATED PACKS, NO SMELL OR NOISE NOTED AT THIS TIME. REMOVED MEL.