As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING PLASTIC ODOR DURING DESCENT IN 1ST CLASS, NOT STRONG UPON ENTERING THE ACFT, CAN DETECT AN ELECTRICAL ODOR ORIGINATING MOSTLY IN THE FLT DECK. ELECT MAINT PAGE PARAMETER READINGS. ALL APPEAR NORMAL AND NO FAULTS OR STATUS MESSAGES DISPLAYED. FIRST CLASS SEAT 2K CONFIRMED TO HAVE FAILED POWER SUPPLY CAUSING BURNING ODOR. PERFORMED OPS CHECK OF THE NR 1 AND 2 PACKS FOR ODOR. NO FAULT FOUND OPS CHECK GOOD. COMPLIED WITH AMM TASK 05-51-58-800-801C3.