As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - FLT 538 - LEFT EMERGENCY DOOR (L3) WARNING LIGHT CAME ON DURING CLIMB-OUT FROM MIA. AIRCRAFT RETURNED TO FIELD. MAINTENANCE PERFORMED DOOR FIM PROCEDURE. NO PROBLEMS WERE FOUND. DOOR WAS CHECKED OPERATIONALLY AND NO PROBLEMS WERE NOTED. AIRCRAFT WAS RELEASED FOR SERVICE. REFERENCE: OPERATOR CONTROL NR USAABB96006A.