As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE SHUTDOWN, THE NR 2 ENGINE WAS STILL AT MOTORING SPEED. NOTICED START VALVE WAS STILL IN GROUND. NEVER GOT ANY INDICATION BY EICAS OR VALVE LIGHT ON BY START SWITCH. REMOVED AND REPLACED THE NR 2 ENGINE START SWITCH IAW AMM 80-11-51. PERFORMED A NR 2 ENGINE START PROCEDURES IAW AMM 80-11-00. NO FAULTS NOTED.