What was found
WHILE TAXIING, AMBER CABIN DOOR OPEN CAS MESSAGE ILLUMINATED. DISCOVED CABIN DOOR OPEN CAUTION LIGHT AT DOOR HANDLE ALSO HAD ILLUMATED. QRH RESET PROCEDURE WAS INEFFECTUAL EVEN AFTER POWERING DOWN THE AIRCRAFT. PUSH TO OVERRIDE LIGHT WOULD NOT FLASH. UPON OPS CHECKING MAIN CABIN DOOR MULTIPLE TIMES TECHS FOUND THE MAIN CABIN DOOR (S6) PAWL PROX SWITCH INTERMITTENTLY FALLING. REMOVED CED MONITOR PCB & INSTALLED NEW CEO MONITOR PCB IAW AMM 24-60-40. REMOVED THE MAIN CABIN DOOR (S6) INNER HANDLE PAWL PROX SWITCH AND INSTALLED NEW PROX SWITCH IAW AMM 52-70-10. ALL OPS CHEKED SATISFACTORY. NO FURTHER DEFECTS NOTED AT THIS TIME.