What was found
HELICOPTER WAS BEING GROUND RUN AFTER A MAIN DRIVESHAFT REPACK. THE ENGINE ELECTRICAL HARNESS CAUGHT FIRE. THE FIRE PROPAGATED ABOUT 4 INCHES ALONG THE HARNESS BEFORE IT WAS EXTINGUISHED. THE FIRE WAS SMALL AND CONTAINED TO THE HARNESS ONLY. NO OTHER DAMAGE WAS NOTED. NO WORK HAD BEEN PERFORMED IN ORON THE ENGINE. THE FIRE OCCURED AT THE DIODE IN THE WIRE OF THE ANIT-ICE SOLENOID CIRCUIT. THE HARNESS HAS A CHAFE GUARD AND WAS TY-WRAPPED IN THIS AREA. NO SPECIFIC RECOMMENDATION TO PREVENT RECURRENCE.