As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NEARING TOP OF CLIMB THE CABIN CONTINUED A SHALLOW CLIMB PAST THE SCHEDULED CABIN ALTITUDE. IN RESPONSE THE PILOT DONNED HIS OXYGEN MASK AND INSTRUCTED PASSENGERS TO DO THE SAME WHILE HE EXECUTED A NORMAL DESCENT. AN EMERGENCY DESCENT WAS NOT PERFORMED. THE MAXIMUM CABIN ALTITUDE REACHED 14,000 FEET WITH AIRCRAFT AT FL 220. THE DESCENT AND RETURN WAS NORMAL WITH NO FURTHER INCIDENT. AFTER LANDING NEITHER PILOT NOR ANY PASSENGERS REPORTED ANY PHYSIOLOGICAL ISSUES.