As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING THE SQUIB FIRING SYS CHECK FOR DEFERRAL OF NR1 ENG AGENT 1 SQUIB LIGHT REF MEL2621H STE P "F-6", UNABLE TO DETECT 28 VDC ON PIN 2 OF CONNECTOR 5WE1. REF AMM FOR CHECK OF FIRING CHECK CONTINUITY. FOUND BROKEN WIRE 6 INCHES FROM NR 1 FIRE BOTTLE SQUIB 5WE1 IN NR 1 PYLON. REPLACED BROKEN WIRE FROM CONNECTOR VC473 TO SQUIB CONNECTOR. TESTED OK. REPAIRED CONDUIT.