As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWENTY MINUTES FROM DESTINATION, FIRE LIGHT AND AUDIO TRIGGERED THREE TIMES WITH DURATION OF LESS THAN 5 SECONDS EACH TIME. ACFT RETURNED TO DEPARTURE WITH EIGHT MORE TRIGGERS ENROUTE TO BASE. NO OTHER INDICATIONS NOTED. AVIONICS TECH OHMED ALL WIRES IN SYS WITH NO DISCREPANCIES NOTED, REPLACED FIRE DETECTOR AND CLEANED CONNECTOR PLUGS AND TEST FLOWN WITH NO FURTHER PROBLEMS.