What was found
WHILE CRUISING AT 43,000 FT WE ENCOUNTERED LIGHT TURBULENCE/MODERATE CHOP. AFTER IT STOPPED, RECEIVED AMBER CAS MESSAGE CABIN DOOR OPEN. ACCOMPLISHED RESPECTIVE QRH & MONITORED PRESSURIZATION FOR REMAINDER OF FLIGHT. NO PRESSURIZATION ISSUES. AMBER CAS MESSAGE CABIN DOOR OPEN REMAINED UNTIL LANDING AT DESTINATION. REMOVED CABIN DOOR OPEN PROX SWITCH AND REPLACED WITH CUSTOMER SUPPLIED NEW SWITCH. REMOVED CABIN DOOR VENT PROX SWITCH AND REPLACED WITH CUSTOMER SUPPLIED NEW SWITCH AND REMOVED NC 105 PCB AND REPLACED WITH CUSTOMER SUPPLIED NEW PCB. RIGGED DOOR PROX SWITCH. PERFORMED SYS OPS CHK, NO DEFECTS NOTED. SYSTEM OPS CHKD GOOD. REINSTALLED DOOR PANEL & STAIRS. WORK PERFORMED IAW AMM 52-70-10 AND 24-60-40.