As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THROUGH APPROX 5000 FEET RECEIVED A MASTER WARNING FOR THE RIGHT OVERWING EMERGENCY EXIT DOOR OPEN. STOPPED CLIMB AND REQUESTED VECTORS FROM ATC WHILE WE RAN THE QRH. WE ASKED THE F/A'S TO CHECK FOR AT LEAST ONE GREEN INDICATOR ON THE OVERWING EXIT DOOR PER THE QRK. F/A REPORTED, COULD SEE NO GREEN INDICATORS. RETURNED TO THE AIRPORT TO HAVE THE EXIT DOOR INSPECTED BY MX. ***FURTHER UPDATES TO COME ON FINDINGS***