As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENGINE SYS A FIRE DETECTION FAULT BITE INDICATES UPPER FAN DETECTOR FAULT. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 26-10 TASK 805, REMOVED AND REPLACED ENG #1 LOOP A FIRE LOOP PER B737-800 AMM 26-11-01 FIRE DETECTION TEST NORMAL OPS CHECK GOOD.