What was found
(CAN) DURING AN ENGINE GROUND RUN, THAT WAS BEING PERFORMED FOR AN OIL PRESSURE INDICATION PROBLEM, THE FIRE WARNING WAS ACTIVATED. THE ENGINE WAS SHUT DOWN, BOTTLES WERE NOT TRIGGERED. THE ENGINE AND NACELLE ZONES WERE INSPECTED FOR EVIDENCE OF ANY LOCAL HOT SPOTS. NO PROBLEM EVIDENT. THE ENGINE WAS RESTARTED AND AGAIN THE FIRE WARNING WAS TRIGGERED. PEC LOOP WAS REPLACED, AND THE PROBLEM WAS SOLVED. 1946.5 HRS, 2323 CYCLES