As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT THE ENGINE FIRE AUDIO SOUNDED WITHOUT THE ACCOMPANYING ENGINE FIRE WARNING LIGHT. AIRCRAFT WAS LANDED AT BASE WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND PLUG 105W - FOR COPILOT CYCLIC STICK - COVERED IN SOME SORT OF STICKY SUBSTANCE THAT HAD MIGRATED INTO CONNECTOR. POSSIBLY A SPILL OF COKE OR COFFEE WITH SUGAR. CLEANED WITH MISTY AND APPLIED STABILANT 22. DURING OPS FLIGHT PERFORMED PERCUSSION AND WIGGLE TESTS ON ALL APPLICABLE SWITCHES IN COCKPIT TO NO AVAIL.