As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT AIR TURN BACK DUE TO (RT ENGINE BLEED OFF) AND (RT PACK OFF) MESSAGES AT 310 FT, LOOSING CABIN PRESSURE AND APPEARING MESSAGE OF CABIN ALTITUDE WITH AUDIBLE ALARM. AIRCRAFT WAS SENT TO THE HANGAR. PILOT PRESSURE REGULATOR AND TEMPERATURE SENSOR OF ENGINE 2 AND ALL OXYGEN CYLINDER WERE REPLACED IAW MM RESPECTIVELY, ALL TEST CORRECT.