As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENGINE FIRE OVERHEAT DETECTION TEST FAILED. DETECTION LIGHT DOES NOT ILLUMINATE WITH OVHT DET SWITCH IN MANUAL - IT DOES ILLUMINATE WITH OVHT DET SWITCH IN THE A POSTITION. GROUNDED - YES. PER FIM 26-10 TASK 805, FOUND ENG 2 UPPER FAN DETECTOR B LOOP RESISTANCE TEST NOT IN LIMIT, REPLACED NEW DETECTOR ELEMENT & OPS TEST GOOD REF B737-800 AMM 26-11-01.