As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT FIRE BOTTLE ARMED LIGHT ILLUMINATED AND EICAS DISPLAYED"CRG AFT FIREX HI ARM". REMOVED FROM SERVICE AND FERRIED FOR REPAIRS. REPLACED AFT CARGO COMPARTMENT SMOKE(AFT) DETECTOR, PERFORMED OPERATIONAL TEST PER E175 MM TASKS 26-15-01-000-801-A & 26-15-01-400-801-A, ALL CHECKS GOOD. RETURNED TO SERVICE.