As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TEST, THE NR 1 ENGINE FIRE HANDLE AND ENG 1 OVERHEAT DOES NOT ILLUMINATE. GROUNDED - YES. FOUND THE NR 1 ENG AFT RIGHT DETECTOR 2 "B" OUT OF LIMITS PER TASK 26-10 TASK 810. REMOVED AND REPLACED AFT RIGHT DETECTOR 2"B" IAW AMM 26-11-01. ACCOMPLISHED ENGINE FIRE DETECTION OPS TEST - TEST PASSED.