What was found
FLT 2019 - DCA-GRR - DURING FLIGHT, AN CAS MESSAGE FOR THE CABIN DOOR ILLUMINATED. THE CREW DIVERTED TO PIT. MAINTENANCE REPLACED A PROXI SENSOR AND RETURNED THE A/C TO SERVICE. LATER THE SAME DAY ON FLT 2162 - MKE-IAD, THE CAS MESSAGE FOR THE CABIN DOOR ILLUMINATED. THE CREW MADE AN AIR-TURN-BACK TO MKE. MAINTENANCE INSPECTED THE A/C ON THE GROUND AND DURING A MX FLIGHT. MAINTENANCE ADJUSTED THE SPRING TENSION, RE-RIGGED THE DOOR AND OPERATION CHECKED THE DOOR WITH NO FURTHER DEFECTS. MAINTENANCE RELEASED THE A/C TO SERVICE. (M)