As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE AND BURNING SMELL COMING FROM PASSENGER SERVICE UNIT ABOVE SEATS 1AB. *S/D* THE OVERHEAD SEAT DECODER AT SEAT 1AB WAS BURNED INTERNALLY. THERE WAS NO SIGN OF MOISTURE OR OTHER EXTERNAL CAUSE OF THE SMOKE DAMAGE. REPLACED THE OVERHEAD SEAT DECODER, OPERATIONS CHECK NORMAL.