As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNED CIRCUIT TRACES ON CELL HEATING RESISTOR (HR1). HEATING RESISTOR IS DELAMINATING AT ONE OF BURNED AREAS. FOUND DURING ROUTINE INSPECTION OF UNIT. ALTHOUGH THESE HEATING RESISTORS BURN AT RANDOM SERIES AREAS, MOST COMMON AREA IS BETWEEN CELLS NR 9 AND NR 12.