As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - CREW REPORTED RAPID DEPRESSURIZATION AT FL340. CABIN CLIMB AS HIGH AS 13000. MASKS DID NOT DEPLOY. EMERGENCY DECLARED, LANDED MIA WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED GROUND SERVICE SWING CHECK VALVE. SYSTEM GROUND CHECK NORMAL OPERATION.