What was found
FOLLOWING RIGHT ENGINE START, FLIGHT CREW NOTICED YELLOW FLASH ON RIGHT SIDE OF AIRCRAFT AS WELL AS LOSS OF N1 INDICATION ALONG WITH SMELL OF JET FUEL. NO FIRE WARNING WAS PRESENT ON EICAS. ENGINE WAS KEPT RUNNING FOR A SHORT TIME, BEFORE SHUTTING DOWN BY USE OF QRC AND QRH BACK COVER ENGINE FIRE ON GROUND CHECKLIST. GROUND CREW REPORTED SOME FIRE STILL PRESENT IN ENGINE CORE SO FIRE BOTTLE 1 WAS DISCHARGED. SUBSEQUENTLY, AMT CONNECTED VIA HEADSET AND RECOMMENDED MOTORING ENGINE. MOTORING WAS ACCOMPLISHED AND SITUATION WAS STABILIZED AS CFR RESPONSE ARRIVED. POOLED FUEL IN ENGINE WAS STILL BURNING SO FIRE TRUCK SPRAYED WATER INTO ENGINE. FIRE WAS THEN EXTINGUISHED AND AIRCRAFT WAS TOWED BACK INTO GATE. EMERGENCY DECLARED. AMM: 73-21-01-4 REPLACED FUEL CONTROL PER REFERENCE ABOVE. REQUIRES LEAK CHECK AND OPS RUN. AMM: 71-00-00-2 NO LEAKS NOTED ON DRY/WET MOTOR PER REFERENCE ABOVE. OPS NORMAL FOR ENGINE START AND IDLE FOR 5 MINUTES. OPS NORMAL AT THIS TIME. PREPPING FOR POWER RUN AT THIS TIME. AMM: 71-00-00-5 ENGINE RUN CHECKED NORMAL. ALL PARAMETERS WITHIN LIMITS AT THIS TIME PER REFERENCE ABOVE. ACFT OK FOR SERVICE