As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 9500’ WE GOT A MASTER WARNING FOR CABIN PRESSURE. WE IMMEDIATELY LEVELED AT 10,600’. AFTER A BRIEF DISCUSSION AND EVALUATION, WE DECIDED TO RETURN TO THE AIRPORT. A NORMAL DESCENT AND APPROACH WAS COMPLETED. NO EMERGENCY WAS DECLARED.