What was found
CABIN DOOR OPEN AMBER CAS: CABIN DOOR OPEN AMBER CAS REMAINS ILLUMINATED AFTER DOOR IS CLOSED. COMPLETES CABIN DOOR OPEN QRH. DURING STEP 4 CHECK HANDLE/PUSH TO OVERRIDE LIGHTS DID NOT FLASH. POWERED AIRCRAFT DOWN AND CAS STILL REMAINED ILLUMINATED WHEN CABIN DOOR WAS CLOSED. "CORRECTIVE ACTION" REMOVED CED MONITOR PCB ASSY P/N 7466101-17 S/N 0462 AND INSTALLED NEW CED MONITOR PCB ASSY P/N 7468101-14 S/N 0386 IAW CE-680A AMM 24-60-40 AND IPC 24-60-40,