As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJC ON FLIGHT 2458- RECEIVED A AMBER CABIN ALTITUDE MESSAGE IN CLIMB FOLLOWED BY A RED CABIN ALTITUDE MESSAGE. LEVELED AT 12,000 FEET, CABIN WAS AT 10,800 FEET. FOLLOWED CHECKLIST, WAS UNABLE TO CONTROL CABIN PRESSURE UP OR DOWN. INSPECTED AFT BAY DOOR. NO DEFECTS NOTED. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.