As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AUTO SHUTDOWN AT GATE WITH LOW FUEL PRESSURE WARNING ON ECAM. SHORTED WIRE NEAR APU CIRCUIT BREAKER. DURING REPLACEMENT OF CB AA8, POWER WAS APPLIED TO ACFT & ARCING OCCURRED. WIRE HAS INSULATION DAMAGE TO SEVERAL AREAS. DURING WIRE INSPECTION FOUND WIRES DK24-190 AND DK24-196 TO BE DAMAGED BEYOND REPAIR AND IN NEED OF REPLACEMENT. NO EVIDENCE OF ANY OTHER WIRE DAMAGE. C/B REPLACED.