What was found
CABIN DOOR OPEN AMBER CAS: DURING DESCENT CABIN DOOR AMBER CAME ON PRESSURIZATION WAS FINE. AFTER LANDING PLANE WAS SHUT DOWN AND TURNED BACK ON CABIN DOOR WAS OPENED AND CLOSED AND DOOR WOULD NOT LOCK AND NO FLAGS. REMOVED PCB NC105 AND INSTALLED AS RECEIVED NEW PCB NC105. OPS CHECKS GOOD WITH NO FURTHER DEFECTS NOTED AT THIS TIME. ALL WORK WAS PERFORMED I.A.W. CESSNA 680A MM 52-10-04, 24-60-40, 52-70-10, 52-70-00, 31-59-00 AND 52-10-50 AND IMM 25-10-03.