As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF THE CREW SAW THE MAIN CABIN DOOR CAS MESSAGE ILLUMINATE AS WELL AS THE CABIN VENT DOOR CAS MESSAGE. BOTH CAME ON AT 11,000 FEET WHILE DEPARTING ASPEN. THEY RETURNED TO ASPEN AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE INTERIOR CABIN DOOR HANDLE LOOSE. IT WAS TIGHTENED AND OPS CHECK GOOD.