What was found
AT FL410 WE HAD A RED DOOR PAX OPEN CAS MESSAGE APPEAR. AFTER ABOUT 2 MINUTES THE LIGHT WENT OUT, AND THEN DURING OUR DESCENT IT CONTINUED TO COME ON AND OFF THROUGHOUT THE REST OF THE FLIGHT. CORRECTIVE ACTION: REMOVED AND REPLACED MCD WIRE HARNESS IAW PHENOM 300 SWPM 20-45-30. P/N: 507-26093-401 LOT NO. F043180584. REMOVED AND REPLACED #4 PAX DOOR SWITCH REF PHENOM 300 MM 52-71-20. OPS CHECKS GOOD NO DEFECTS NOTED AT THIS TIME. DOOR SWITCH P/N OFF 505-25962-401 P/N ON 505-25962-401