What was found
FLT NR 4401 - PQI-BOS - DURING FLIGHT, THE LEFT INTAKE HEAT FAILED. DUE TO EXISTING WEATHER CONDITIONS, THE AIRCRAFT DIVERTED INTO PWM AND LANDED WITHOUT INCIDENT. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT. MAINTENANCE REMOVED AND REPLACED THE LOWER DUCT DUE TO A BURN HOLE IN THE HEATING MAT OF THE DUCT. THE SYSTEM WAS OPERATIONS CHECKED AND NO FAULT WAS FOUND. AIRCRAFT WAS RELEASED TO SERVICE. (M)