As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GRR/EWR---CO2355, CREW REPORTED, ( NR 1 ENGINE FIRE INDICATION IN CRUISE FLIGHT, DIVERTED)....MAINTENANCE TROUBLESHOT, REMOVED AND REPLACED NR 1 ENGINE FIRE DETECTION CONTROL MODULE (PN: 902061 SN: 236) IAW EMB145 AMM NR 26-11-03. REMOVED AND REPLACED NR 1 ENGINE FIRE DETECTOR (PN: 3601-133-500/230C-9.0M SN: 228082) IAW EMB145 AMM NR 26-11-01. OPERATIONAL TEST OF NR 1 ENGINE FIRE DETECTION SYSTEM GOOD IAW EMB145 AMM NR 26-10-00. AIRCRAFT RELEASED FOR SERVICE.