What was found
FLT 267 - MMCU-MELP - FLT CREW DISCOVERED THE COCKPIT HEATER WAS INOPERATIVE. WHILE ATTEMPTING TO ROUTE HEAT FROM WING HEATER TO COCKPIT (PER ALTERNATE PROCEDURE KHA COM 21-5), BURNED ODOR AND SMOKE ENTERED THE COCKPIT HEAT DUCT. INSPECTION FOUND ONE OF THE BEARINGS (P/N 631140081) IN THE VENT AIR BLOWER HAD FAILED CAUSING THE MOTOR TO OVERHEAT. NEW VENT AIR BLOWER ASSEMBLY INSTALLED, SYSTEM OPERATIONAL CHECKED NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. (M)