As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO FLT DECK RADIO OR ENGINE ABNORMALITIES WITH ENGINES OFF WHILE AT GATE. POSSIBLE LIGHTNING STRIKE AFT CABIN. CABIN FILLED UP WITH SMOKE. SMOKE SEEMED TO BUILD FROM AFT CABIN AND MOVED FORWARD. SEE LOGPAGE# 2852978 FOR WORK ACCOMPLISHED WITH SMOKE IN CABIN. PERFORMED LIGHTING STRIKE INSPECTION IAW AMM 05-51-19. NO DEFECTS NOTED AND NO EVIDENCE OF LIGHTING STRIKE AT THIS TIME.