As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE FIRE WARN INTERMITTENTLY ACTIVATED. OPEN COWLS AND ENG LOWER STUB WING PANEL TO FOM, PERF RESISTANCE CK PER BOEING AC MM 26-11-001-1. INSP ALL DUCTS FOR LEAKS, NONE NOTED. CLEANED ALL CONNECTORS FOR LOOPS, TIGHTENED ALL BLD DUCTS AND ALUMINUM FOIL.