As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENG FIRE WARNING LIGHT AND BELL SOUND INTERMITTENTLY. WARNING SILENCED BY OPEN NR 1 ENG SYS A DETECTION CIRCUIT BREAKER, BOTH FIRE SYS TEST SAT. *S/D* INSTALLED STUB WING PNLS. REMOVED AND REPLACED FIRE DETECTION CONTROL UNIT, ALL CK OK MM 26-11.