As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DEPARTURE, WITH THE NR 4 ENGINE SHUTDOWN. CREW REPORTED THAT THEY HAD THE NR 4 ENGINE SURGE AT 600 FT AND THEN ABOUT 15 SECONDS LATER HAD A NR 4 ENGINE FIRE WARNING. FOLLOWED QRH AND BLEW BOTH FIRE BOTTLES, FIRE WARNING EXTINGUISHED. ENGINE CHANGE IN PROGRESS.