As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 340 GOT THE CABIN ALTITUDE WARNING HORN THE CABIN ALTITUDE WENT BETWEEN 12,000 TO 14,000. MASKS DROPPED AND EMERGENCY DECLARED. THIS WAS REPORTED TO THE FODM BY THE CAPT FOR MX FERRY .THIS LOGPAGE IS OPEN, FURTHER DETAILS AWAITED.