As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT ATTENDANT REPORTED THAT THE 4L DOOR CABIN PRESSURE LIGHT STARTED FLASHING WHEN WE REACHED CRUISE. WE LOOKED ON DOOR PAGE AND 4L SHOWED NOT ARMED EVEN THOUGH DOOR WAS ACTUALLY ARMED CABIN SHOWED. SUPPLEMENTAL REPORT: PERFORMED TSM 52-73-00 AND NO FAULTS WERE NOTED. A SATISFACTORY OPERATION CHECK WAS ACCOMPLISHED PER AMM 52-73-00. (CLOSED)