As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, ACFT WOULD NOT PRESSUREIZE INITIALLY. AFTER REACHING 500 FT, AIRCRAFT FINALLY PRESSURIZED AFTER LEVELING OFF AND CONTINUED TO PERFORM NORMALLY. RETURNED TO FIELD. R & R CABIN PRESSURE CONTROL PANEL IAW AMM. OPS CHECKED GOOD.