As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4150 THE CREW REPORTED E2 FIRE DET FAIL ON INTERMITTENTLY INFLIGHT, CRUISE, DESCENT AND APPROACH. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED INSULATION REPAIR ON W407-0014-20 & W407-0013-20 APPROX 3 FT FROM PO914 IAW EMB SWPM 20-21-00. FIRE DETECTION SYS OPS CHECK GOOD PER EMB 140 MM 26-10-00. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.