As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3830 -DIV/PRESS- DIVERTED TO LAS DUE TO CABIN PRESSURE CLIMBED ABOVE 14K FEET. MASKS DEPLOYED. CORRECTIVE ACTION: MAINTENANCE FOUND GROUND CONNECTION AIR CHECK VALVE DETACHED FROM DUCT. INSTALLED CHECK VALVE AND MIX MANIFOLD PER B737 MM 21-21. PRESSURIZATION OPS CHECK OK.