As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS - ELEC APU GEN FAULT ECAM // PERFORMED BITE OF EPGS REF. AMM 24-41-00-740-801-A. FAULT CODE 242317 WAS CAPTURED. CTA(21XS)/GAPCU(40XG). USING TSM 24-20-00-810-999-A FOUND GAPCU INOP. REMOVED & REPLACED GAPCU REF. AMM 24-41-34. OPS CHECK GOOD. BITE TESTS PASSED. NO DEFECTS NOTED. OK FOR SVC. CONTROL UNIT, G OFF 33-2441-9-0001 S/N 04382 ON 33-2441-9-0001 S/N 07608