As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CARTRIDGE FAILED RUPTURE DISC, OF FIRE EXTINGUISHER. SUSPECT CAUSE: CARTRIDGE FAILED TO RUPTURE DISC BECAUSE OF INSUFFICIENT EXPLOSIVE ENERGY IN OVERLAND AVIATION MANUFACTURED CARTRIDGE. CARTRIGE IS NOT AN APPROVED (OEM) WALTER KIDDE AEROSPACE COMPONENT. RECOMMENDATION: USE ONLY OEM APPROVED PARTS.