What was found
AFTER TAKEOFF, BOTH CREW NOTICED A "DIFFERENT" SOUND FROM ENGINES. ACFT SOUNDED LIKE MAY HAVE HAD A COMPRESSOR STALL BUT WE HAD NORM ENG INDICATIONS. AT 200' RECEIVED AN ENGINE FIRE LIGHT ON ENG NR 2. AFTER ABOUT 15-20 SEC. WARNING WENT OUT AND RECEIVED AN ENG 2 LOOP A FAULT. ELECTED TO DIVERT, ABOUT 5 MINUTES, RECEIVED A LOOP B FAULT ON ENG 2. PERFORMED VISUAL INSPECTION IAW FIM AND SENT DOWNLOAD DATA TO ENGINEERING. NO ABNORMAL OPERATION OF ENGINE FOUND. TIGHTENED B LOOP, REPLACED A LOOP AND REPLACED FDCU. OPS CHECKED GOOD.