As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) A/C FAILED TO PRESSURIZE AFTER TAKEOFF. UPON RETURN TO BASE THE A/C STILL WOULD NOT PRESSURIZE ON "TEST" POSITION. MAINTENANCE DETERMINED THAT THE CABIN PRESSURE SAFTEY VALVE SOLENOID (DESIGNATOR E 105) WAS FAILED OPEN, NOT ALLOWING THE SAFTEY VALVE TO CLOSE AFTER TAKEOFF. THE SOLENOID VALVE WAS REPLACED AND THE A/C WAS TEST FLOWN WITH PRESURRIZATION SERVICEABLE.