As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE FIRE BOTTLE INADVERTENTLY DISCHARGED IN FLIGHT. IT`S THE MIDDLE BOTTLE IN THE AFT SERVICE COMPARTMENT. CHECKED CARTRIDGE FIRING CIRCUIT FOR VOLTAGE AND FOUND NONE. REPLACED THE LT FIRE EXTINGUISHER AND ENGINE EXTINGUISHER CARTRIDGES. CONDUCTED TEST OF FIRE SYS. NO DEFECTS NOTED. MX IAW MM 26-205.