As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW INFLIGHT T1174/14APR - CREW REPORTED NO GREEN LIGHT WHEN LANDING GEAR WAS EXTENDED. TOWER CONFIRMED GEAR DOWN AND LOCKED. LANDED DFW WITHOUT INCIDENT. REPLACED PROXIMITY ELECTRONIC SWITCH UNIT AS PRECAUTION. SYSTEM GROUND CHECKED NORMAL OPERATION.