As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE SHOP OVERHAUL OF AN EVACUATION SLIDE REMOVED FOR EXPIRATION OF TIME, THE UNIT FAILED TO FLAT FIRE. MECHANIC PULLED THE FIRING LINE WITH A FORCE OF 20 LBS AND THE BOTTLE VALVE DID NOT OPEN. THE BOTTLE VALVE MANUFACTURER (CARLTON) HAS THE VALVE, (P/N 61199-107) (S/N 2136), UNDER INVESTIGATION.