As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING SCHEDULED MAINTENANCE, WHEN THE AFT CARGO FIRE BOTTLE TEST BUTTON WAS DEPRESSED, BOTH AFT CARGO FIRE EXTINGUISHERS DISCHARGED. INVESTIGATION FOUND THE Ï¿½PUSH TO DISCHARGEÏ¿½ SWITCH ON THE CARGO FIRE PANEL WAS SHORTED INTERNALLY CAUSING THE BOTTLES TO DISCHARGE. THE SWITCH WAS REPLACED AS WELL AS THE FIRE BOTTLES AND SQUIBS.PUSH TO DISCHARGE SWITCH .