As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 10,000 FEET, THE CREW RECEIVED A GALLEY DOORS LIGHT OPEN AND CLOSING INDICATION. THE AIRCRAFT WOULD NOT PRESSURIZE AND FLIGHT 4158 THEN DIVERTED TO IAD. MAINTENANCE INSPECTED AND CLEANED THE GALLEY DOOR PROXY SWITCH IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.