As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT AUTO PRESS HALF FAIL IN CLIMB. REMOVED AND REPLACED NUMBER 1 SAFETY VALVE IAW AMM 21-32-03. OPS CHECK IAW AMM 21-32-03. NO DEFECTS NOTED PRESSURIZED AIRCRAFT IAW AMM 21-31-00. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.