What was found
AFTER NR 1 ENGINE START, A RECEIVED WINDSHIELD HEAT INOP LT CAS MESSAGE. RAMP PERSONNEL SIGNALED TO SHUTDOWN. NOTICE LARGE AMOUNTS OF SMOKE FROM ENGINE. EVIDENCE OF A FIRE CAN BE SEEN INSIDE OF COWLING. FOUND BURNS ON INSIDE OF ALTERNATOR EXHAUST ON LOWER COWL & ON EXHAUST DUCT SEAL & BURNED ELECTRICAL ODOR. NOTICED MELTED COPPER ON GROUND. REMOVED AC GENERATOR & INSTALLED A REPAIRED UNIT IAW MM 24-20-01. REMOVED AC GENERATOR POWER CONTROL UNIT & INSTALLED AN INSPECTED UNIT IAW MM 24-20-01. OPS BOTH ENGINES & AC GENERATOR SYSTEMS. OPS AND LEAK CHECKED NORMAL.