What was found
ILLUMINATED ENG. FIRE LIGHT, DETECTED 8 MIN INTO A PATIENT FLIGHT FROM A REFERRING FACILITY TO ANOTHER HOSPITAL. PILOT COMPLETED A PRECAUTIONARY LANDING, THE LANDING WAS UNEVENTFUL AND WITHOUT ISSUE. THERE WAS NO EVIDENCE OF AN ENGINE FIRE AT ANY TIME. MAINTENANCE RESPONDED AND INSPECTED THE A/C. EMERG. LIGHT WAS UNABLE TO BE RE-PRODUCED AND NO ISSUES WITH THE SYSTEM WERE FOUND. ON POST MAINTENANCE GROUND RUNS AND HOVER FLIGHT THE ISSUE WAS UNABLE TO BE DUPLICATED AS WELL. AFTER THE A/C WAS RETURNED TO SERVICE, THE REPOSITION FLIGHT WERE ALSO UNEVENTFUL AND NO ISSUES WERE NOTED OR ILLUMINATION OF ANY FIRE INDICATORS. LATER THAT EVENING ON A SEPARATE FLIGHT, THE ENGINE FIRE LIGHT ILLUMINATED AGAIN AND A SECOND PRECAUTIONARY LANDING WAS MADE. MECHANIC REPLACED ALL 3 ENGINE FIRE DETECTORS AND RETURNED THE A/C TO SERVICE. NO FURTHER ILLUMINATION OF THE FIRE LIGHT OCCURRED ON THE FLIGHT BACK AND THE A/C HAS BEEN RETURNED TO FULL SERVICE.