As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE ALT RT GEN FAILED WITH AN AC CROSSTIE LOCKOUT. RT GEN WAS RESTORED AND FLT CONTINUED WITH GENS ISOL. NO FURTHER EVENTS. APU INOP ON PREV MCO/PLAC. CKD CSD SVC, CKS GOOD. FOUND GEN FAULT ON GCU. REPLACED SAME AND RAN ENGS. GENS AND AC CROSSTIE OPS NML PER PFHB. MCO ON APU GEN CLEARED.