As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK / DECLARED EMERGENCY. ON TAKEOFF HAD 0 FAULT LIGHT ON FIRE DETECT SYS. THIS WAS FOLLOWED BY A NR 2 ENG OVERHEAT AND A NR 2 FIRE LIGHT. BOTH THE ENG OVERHEAT LIGHT AND FIRE LIGHT AS WELL AS THE FAULT LIGHT EXTINGUISHED WITHIN SECONDS. REMOVED AND REPLACED SENSE LINE PER MM.