As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING STARTUP, THE NR 1 ENGINE TWIST GRIP LIGHT REMAINED ILLUMINATED. THE AIRCRAFT WAS SHUTDOWN AND MAINTENANCE WAS NOTIFIED. FOUND THE SWITCH WAS STICKING AND OUT OF ADJUSTMENT. THE SWITCH WAS CLEANED AND ADJUSTED AND THE AIRCRAFT WAS RETURNED TO SERVICE.