What was found
EWR - FLT NR 3614 - PRIOR TO AIRCRAFT TAXI, PROP BRAKE FAILED CAUSING ENGINE NR 2 TO CATCH ON FIRE. THE NR 1 AND NR 2 FIRE BOTTLES WERE DISCHARGE. MAINTENANCE INSPECTED THE NR 2 ENGINE AND FOUND THE PROP BRAKE TO HAVE OVERHEATED. MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE AND PROP BRAKE IAW ATR MAINTENANCE MANUAL 72-00-00, ALL OPERATIONAL AND LEAK CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. THE NR 2 ENGINE WAS CHANGED DUE TO DRY CHEMICAL FIRE AGENT BEING SPRAYED INTO THE ENGINE INLET. (M)