As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: DOOR 3L EVACUATION LIGHT ALWAYS ILLUMINATED. MAINTENANCE FOUND A FAULT MESSAGE FOR DECODER / ENCODER UNIT B 300RH4 (DEU) WAS DISPLAYED ON THE FLIGHT ATTENDANTS PANEL AND REPLACED THE DEU PER AMM 23-73-47. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ISSUES NOTED.