As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
'ENG FIRE EXTINGUISH-SQUIB' LIGHT OF 'AGENT 1' PUSHBUTTON SWITCH IS OFF DURING 'LOOP-SQUIB TEST'. FOUND BROKEN WIRE 6 INCHES FROM NR1 FIRE BOTTLE SQUIB 5WE1 IN NR1 PYLON. REPLACED BROKEN WIRE FROM CONNECTOR VC473 TO SQUIB CONNECTOR. TESTED OK. REPAIRED CONDUIT.