As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TROUBLE SHOOTING OF C/B POPPING FOUND WIRE BUNDLES BURNED THROUGH, LOCATED IN E&E BAY RT SIDE. TRANSFERRED TO UPS NRC MD015501-REFER FOR DETAILS & SIGN OFF. SUMMARY INCLUDES 247 WIRES REPLACED END TO END, 3 WIRE SPLICE REPAIRED. ALL SYS AFFECTED OPS AND FUNCTIONAL CKD FOR UPS & BOEING ENG INSTRUCTIONS