As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW NOTICED THAT THE CABIN WAS NOT PRESSURIZING AND LEVELED OFF AT 8000 FEET TO TROUBLESHOOT. CYCLED AUTO/MANUAL SWITCH WITH NO SUCCESS. DID NOT DECLARE AN EMERGENCY AND RETURNED TO LAND WITHOUT INCIDENT. MAINTENANCE FOUND THE TOP PROXIMITY SENSOR ON DOOR HAD A CUT WIRE WHICH CAUSED THE DOOR TO SHOW OPEN AND NOT ALLOW DOOR SEAL TO PRESSURIZE. MAINTENANCE R & R THE MAIN CABIN DOOR SENSOR IAW AMM AND OPS CHECKED GOOD.