As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN THERMAL CONTAINMENT BAG USED. REPLACED TCB. SEATS 58F/G HEAT DAMAGE FROM DEVICE - EXTRA BATTERIES IN PAX BACKPACK. DAMAGE TO SEAT CUSHION, SEATBELT AND BUMPER TRIM. THERMAL BAG WAS USED. REMOVED AND REPLACED SEAT CUSHIONS AND SEATBELTS AT 58G AND 58F.