What was found
WE HAD 3 FAILED START ATTEMPTS ON THE #1 ENGINE USING 2 DIFFERENT AIR CARTS. THE AIRCRAFT WAS CONFIGURED ACCORDING TO THE CHECK LIST ALL 3 ATTEMPTS RESULTED IN A FLASHING WHITE EGT BOX AND AUTO SHUTDOWN @ APPROX 450-500 DUCT PRESSURE WAS ABOVE 30 PSI ALL 3 TIMES AND N2 WAS AT 25.1% PRIOR TO INTRODUCTION OF FUEL. GROUNDED - YES. PERFORMED FIM 80-05 TASK 801 - EGT INDICATION FLASHING OR HAD AN AUTOSHUTDOWN. CONFIRMED PROPER SOFTWARE FOR EEC PER AMM TASK 73-21-00-700-800-F00. EXCEEDANCE CHECK REF AMM TASK 71-00-00-740-801-F00 NO EXCEEDANCES, PERFORMED EEC BITE TEST 73-00, TASK 801 NO FAULTS FOUND, NO RECENT FAULTS. CHECKED STARTER CHIP DETECTOR - NO DEBRIS FOUND CLEAN. PERFORMED FIM TASK STEPS THRU 80-05 TASK 801 STEP E(3)(4)(5) NO DEFECTS NOTED. CONTINUED FIM 80-05 TASK 801, FUEL FLOW WAS HIGH. REMOVED AND REPLACED HMU REF W/O 1966620.