As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, THROUGH APPROX 1800 FEET EXPERIENCED RAPID LOSS OF CABIN PRESSURE. DESCENDED AND RETURNED TO DEPARTURE AIRPORT. AFTER EXTENSIVE TROUBLESHOOTING IT WAS DETERMINED THAT THE UPPER FORWARD LATCH HAD A BROKEN CLEVIS PIN AT THE LATCH PIVOT POINT. PRESSURIZATION AND FLIGHT CHECK SATISFACTORY.