What was found
DURING FLIGHT ENGINE OVERHEAT/ FIRE DETECTION FAULT LIGHT ILLUMINATED AND STAYED ILLUMINATED. UPON LANDING TESTED A&B OVERHEAT/ FIRE TEST, BOTH TEST FAILED FOR #1 ENGINE, INDICATING A DUAL LOOP FAILURE ON THE #1 ENGINE. GROUNDED - YES. FOUND FIRE DET ENG #1 C/B POPPED ON (P6-02-14-24) COMPLIED WITH C/B RESET PER B737-800 AMM 20-60-01, PERFORMED GVI AFTER C/B RESET, OPS NORMAL, COMPLIED WITH ENG FIRE DET SYS OPS TEST PER AMM 26-11-00-710-801, OPS TEST NORMAL, FAULT LIGHT EXTINGUISHED.