As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WIRING LOOM TO NR 2 FUEL PROBE IN THE FUEL TANK APPEARS TO HAVE BEEN CHAFED LEADING TO ARCING WITHIN THE FUEL TANK. WIRING LOOM WAS BEING INSPECTED AS PART OF INSPECTION DOCUMENT (ID) 10 TASK 28-11-00-220. THE DAMAGED LOOM IS IN PANEL 532BB AT WING STATION (WS) 106.21. POTENTIALLY MAY HAVE BEEN THE CABLE TYE FRICTION WHICH WAS CAUSING SAID CHAFING. REPLACED THE LOOM AND CALIBRATE FUEL SYSTEM.