What was found
LHR - FIRST OFFICERS MAP LIGHT INTERMITTANT AND THEN BEGAN TO SMOKE. RETURNED TO LHR AND LANDED WITHOUT INCIDENT. REPLACED FIRST OFFICER MAP LIGHT TERMINAL TAG. NO EVIDENCE OF BURNING FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
LHR - FIRST OFFICERS MAP LIGHT INTERMITTANT AND THEN BEGAN TO SMOKE. RETURNED TO LHR AND LANDED WITHOUT INCIDENT. REPLACED FIRST OFFICER MAP LIGHT TERMINAL TAG. NO EVIDENCE OF BURNING FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION.