As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - FLT 137 - EN ROUTE LHR-LAX - LAX SMOKE WAS NOTED FROM CENTER ARM REST OF SEATS 2HJ. SMOKE STOPPED WHEN POWER TO VIDEO UNIT AT SEAT 2HJ WAS DISCONNECTED. AIRCRAFT CONTINUED TO LAX AND LANDED WITHOUT INCIDENT. REPLACED VIDEO POWER UNIT AT CENTER ARM REST OF SEAT 2HJ. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)