As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A FALSE VERBAL FIRE WARNING ON RT ENGINE WITH NO OTHER INDICATIONS. F/O`S PFD AN DND BOTH FLICKERED ON AND OFF AT THE SAME TIME AS FIRE WARNING. COULD NOT SILENCE WARNING. MAINTENANCE TROUBLESHOT AND FOUND WIRES LOOSE ON RT ENGINE LOOPS SELECT SWITCH ON OVERHEAD ENGINE FIRE DETECT SYSTEM MODULE. TIGHTENED SCREWS. OPERATION CHECKS GOOD. LP 6570639.