As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6431 - LGA-DCA - ENGINE FIRE WARNING NR 1 CAME ON. PULLED ENGINE DETECTOR 'B' LOOP CIRCUIT BREAKER TO EXTINGUISH LIGHT. ENGINE SHUT DOWN. REPLACED NR 1 ENGINE FIRE WALL LOOP. REPLACE, FIRE DETECTOR CONTROL UNIT. FUNCTIONAL CHECK OF NR 1 ENGINE FIRE WARNING SYSTEM OK, PER MM 26-11-01. (M)