As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PRV WAS DAMAGED INSIDE OF THE PACK. SLIDE/RAFT WAS REMOVED FROM AIRCRAFT AT NORMAL MAINTENANCE INTERVAL. DAMAGED PRESSURE RELIEF VALVE WAS OBSERVED DURING SLIDE/RAFT MAINTENANCE. THE EXACT CAUSE OF THE DAMAGE TO THE PRESSURE RELIEF VALVE COULD NOT BE DETERMINED, BUT IT IS SPECULATED IT WAS DAMAGED DURING THE LAST PACKING PROCESS. PRESSURE RELIEF VALVE ASSEMBLY WAS REPLACED.