As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 ENG WAS REPORTED TO HAVE TAIL PIPE FIRE. CREW FIRED BOTH BOTTLES AND RETURNED TO GATE. THERE WAS NO FIRE IND IN COCKPIT. MTC INSPD ENG, NO FLUID LEAKS NOTED. REPLACED BOTH FIRE BOTTLES AND RAN ENG, HAD NORMAL START. FIRE WAS CONTAINED WITHIN THE TAIL PIPE.