As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 6895384) SUSPECTED LIGHTNING STRIKE AT GATE. APU GEN CYCLED ON AND OFF THEN ON FOLLOWED BY ELECTRICAL BURNING SMELL FOR 1 MINUTE IN FLIGHT DECK AND 5 MINUTES IN AFT GALLEY. FOUND APU START GEN SHOWS SIGNS OF ARCING. R/R APU START GEN REF B737 AMM 49-11. OPS CKS GOOD. NO ELECTRICAL ODOR PRESENT.