As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BNA - INFLIGHT DFW-RIC. CREW REPORTED LEFT PACK WOULD NOT HOLD PRESSURIZATION WITH RIGHT PACK ON PLACARD. AIRCRAFT WAS BROUGHT TO BELOW 10,000 FT, MASKS DID NOT DEPLOY. EMERGENCY DECLARED FLIGHT DIVERTED BNA LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. AIRCRAFT WAS FERRIED TO DFW FOR REPAIRS. REPLACED LEFT AND RIGHT PRESSURE REGULATOR VALVES AND PITOT PRESSURE REGULATORS. SYSTEM GROUND CHECKS NORMAL OPERATION.