As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CARGO FIRE SWITCH LIGHT ON THE P-8 PANEL WOULD NOT TEST DURING SYSTEM OR BRIGHT LIGHT TEST. (BULB GOOD) FWD CARGO FIRE SYSTEM PLACED ON MEL DEFERRAL IAW DDG 26-23-01. MDDR 115416. LP 1053596 - M7: REMOVED AND REPLACED FWD LOWER CARGO FIRE SWITCH IAW SWPM 20-84-15. MDDR 115416 CLEARED. PLACARD REMOVED AND MCC NOTIFIED.