As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT THE INDICATION ON THE L2 DOOR WENT RED. F/A REPORTED THAT THE DOOR DID NOT SHOW CLOSED. CREW ELECTED TO RETURN TO DEPARTURE, AN EMERGENCY WAS NOT DECLARED AND CREW LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND PERFORMED PRESSURE CHECKS TO THE L2 DOOR IAW AMM AND ALL CHECKS PASSED. ACFT IS GOOD FOR SERVICE.