As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE NR 3 EPR DROPPED AND EGT ROSE FOLLOWED BY AN ENGINE FIRE WARNING. DISCHARGED ONE FIRE BOTTLE AND AIRCRAFT RETURNED TO SFO AND LANDED WITHOUT INCIDENT. REPLACED THE HIGH STAGE VALVE, HIGH STAGE CONTROL, AND PRESSURE RELIEF VALVE. OPERATIONAL CHECK GOOD.