As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENG FIRE DETECTOR 'B' LOOP INOP. GROUNDED - YES. FIRE DETECTOR MODULE BITE SHOWS #2 ENG 'B' LOOP UPPER FAN INOP. A/C RELEASED PER MEL 26-2B. RETURNED OVH DET SWITCHES TO NORMAL POSITION, PER FIM 26-10 TASK 801. NO LATCHED FAULTS PRESENT, SUSPECTING INTERMITTENT. BITE TEST PASSED, UNABLE TO DUPLICATE FAULT. THIS CLEARS MEL 26-2B.