As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE AT FL260, THE NR 2 ENGINE FIRE WARNING ACTIVATED. THE ENGINE WAS SECURED PER COM AND ONE FIRE BOTTLE WAS DISCHARGED. AN EMERGENCY WAS DECLARED WITH THE FLIGHT LANDING WITHOUT INCIDENT. MAINTENANCE REPLACED THE TWO PNEUMATIC DUCT CLAMPS WHICH SECURE THE ENGINE 8TH STAGE PNEUMATIC CHECK VALVE. ENGINE RUN AND LEAK CHECK GOOD.