As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)STARTER REMAINED ENGAGED AFTER SHUTDOWN OF #2 ENGINE, AND MARSHALLER REPORTED SMOKE. BOTH FIRE EXTINGUISHERS USED AND ENGINE FOAMED BY FIRE DEPARTMENT. CAUSE BELIEVED TO BE STUCK START CONTACTOR. STARTER, CONTACTOR GCU AND BOTH BATTERIES REPLACED.