What was found
(CAN)WHILE GROUND RUNNING, PROPELLER BRAKE CAUGHT ON FIRE. FUEL SHUT OFF AND "HALON" EXTINGUISHER ACTIVATED WHICH PUT THE FIRE OUT IN THE NACELLE HOWEVER, A CONTINUING FIRE IN THE INTAKE HAD TO BE EXTINGUI SHED BY DISCHARGE OF A "FORAY" DRY CHEMICAL. ENGINE SENT TO OVERHAUL SHOP WHERE IT WAS DISASSEMBLED TO INVESTIGATE THE CONDITION AND EXTENT OF CONTAMINATION OF THE GAS PATH WITH EXTINGUISHING AGENT. ALL INTERNAL COMPONENTS CLEANED AND INSPECTED FOR CORROSION. NO CORROSION FOUND.