As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING LEVEL FLIGHT AN ELECTRICAL BURNING ODOUR (ACRID SMELL) CAME FROM SEAT ROW 1-3 LEFT.AIRCRAFT DIVERTED AS A PRECAUTION. COMPLETE INSPECTION OF ROW 1-5 LEFT CARRIED OUT WITH NO OBVIOUS FAULTS WITH WIRING. SEB (SEAT ELECTRONIC BOX) FOR SEATS 2ABC FOUND HEAT DAMAGED. NEW SEB INSTALLED AND OPERATION CHECKED SERVICEABLE.