As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS AT LHR INBOUND CREW REPORTED ON ARRIVAL THAT AN ODOR EMITTED FROM IFE/SEAT POWER VENTS AT SEAT 1J. THE BULKHEAD FOUND IFE POWER SUPPLY BOX CONTAMINATED. MAINTENANCE FOUND IFE PWR SUPPLY BOX CONTAMINATED. REMOVED AND REPLACED SEAT POWER SUPPLY MODULE IAW ESO 21370. (SEE SDR # AALA201910079045)