As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT DID NOT PRESSURIZE & THE CABIN WARNING LIGHT CAB ALT HI DIDN'T COME ON WHEN THE CABIN ALTITUDE WENT ABOVE 10,000FT. ONE OF THE ELECTRICAL CONNECTORS ON THE CAB ALT HI PRESSURE SWITCH WAS FOUND DISCONNECTED. THE CONNECTOR WAS REINSTALLED. THE CREW HAD EXPERIENCED CONSIDERABLE TURBULENCE DURING CLIMBOUT. THE CONNECTORS ARE HELD ON BY FRICTION, WHICH ISN'T A POSITIVE LOCK SYSTEM. RESEARCH IS UNDERWAY TO INSTALL A REPLACEMENT POSITIVE LOCK CONNECTOR TO PREVENT A RE-OCCURRENCE.