What was found
IN CLIMB FL 410 TO FL 430, RECEIVED CAS CHECK DOORS AND CABIN DOOR OPEN. THERE WAS NO PRESSURE CHANGE BUT RAN THE CHECKLIST, ADVISED THE COMPANY AND DIVERTED TO A SUITABLE AIRPORT. AFTER BURNING FUEL TO MAKE LANDING WEIGHT, LANDED NORMALLY. WE DID HAVE THE AMBER LIGHT ON (ON DOOR) BEFORE WE OPENED THE DOOR. WE NOTED THE DOOR WAS JUST PREVIOUSLY WORKED ON BEFORE FLIGHTS THIS MORNING, MAY BE REPEAT ISSUE. INSTALLED SHIMS. OPS CHECK GOOD. IAW AMM 52-10-15