As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE LIGHT AND BELL NR 3 ENGINE AFTER TAKEOFF AT 600 FEET ABOVE GROUND LEVEL. AFTER THROTTLE BROUGHT TO IDLE FIRE LIGHT WENT OUT. BOTH FIRE LOOPS TEST GOOD. LANDED WITHOUT FURTHER INCIDENT. FOUND START VALVE SUPPLY DUCT BLOWN. REPLACED DUCT NR 3 ENGINE. LEAK CHECK GOOD. OK FOR SERVICE.