As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT THE FLIGHT CREW REPORTED SMOKE AND BURNING SMELL IN THE CABIN. DURING MAINTENANCE INVESTIGATION BLACK SOOT WAS FOUND AROUND AFT AIR CONDITIONING VENTS AND THE AFT AIR CONDITIONER BLOWER MOTOR WAS MAKING A METALLIC SOUND AND SHOWED SIGNS OF HAVING BURNED.