As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SERVICE DOOR AMBER CAUTION MESSAGE AFTER TAKEOFF. AIRCRAFT RETURNED TO DAY AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND ADJUSTED THE SERVICE DOOR SWITCH PER THE AIRCRAFT MAINTENANCE MANUAL. CHECKS WERE MADE PER THE AIRCRAFT MAINTENANCE MANUAL AND THE AIRCRAFT WAS RELEASED FOR SERVICE.