As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CABIN NOT PRESSURIZING. CABIN DOOR OPEN AND CABIN DOOR VENT OPEN MESSAGE APPEARED ON EICAS. CORRECTIVE ACTION: TROUBLESHOT SYSTEM. FOUND DEFECTIVE INNER HANDLE PROXIMITY SWITCH TO BE AT FAULT. REMOVED AND REPLACED PROXIMITY SWITCH. OPERATIONAL CHECKS SATISFACTORY AT THIS TIME.