As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FIRE SYSTEM FAULT MESSAGE. MAINTENANCE FOUND FIRE DET A CIRCUIT BREAKER POPPED. RESET CIRCUIT BREAKER. MESSAGE CLEARED. OPERATIONAL CHECK PERFORMED IAW 26-10-00-710-801-A01. CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.