As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SYR - FLT 4320 - DURING CRUISE FLIGHT, THE FLIGHT ATTENDANT REPORTED LOUD NOISE UNDER THE FLOORBOARD FOLLOWED BY A BURNING SMELL AND SMOKE. AN EMERGENCY WAS DECLARED AND AIRCRAFT WAS LANDED WITHOUT FURTHER INCIDENT. REPLACED LEFT AIR CYCLE MACHINE. OPERATIONAL CHECK GOOD. (M)