As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT THE CABIN FAILED TO PRESSURIZE AND MAINTENANCE DECIDED TO MEL THE PRESSURIZATION. DUE TO FUEL CONSIDERATION AT THE LOWER ALTITUDE FLIGHT 4021 DIVERTED TO DAY FOR REFUELING. FLIGHT 4021 THEN CONTINUED TO PIT WITH NO FURTHER INCIDENTS.