As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POST DOCK RUNS THE RUDDER BOOST EICAS LIGHT ILLUMINATED. INSPECTION/TROUBLE SHOOTING FOUND WIRING HARNESS CHAFED THROUGH THE POWER LINES. PROBABLE CAUSE: ROUTING THROUGH LIGHTING HOLE WITHOUT CHAFE PROTECTION AT TIME OF MANUFACTURE.