As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUNWAY ENGINE START. INSTEAD OF STABILIZING AT IDLE, THE RPM AND THRUST INCREASED WITH NO THROTTLE INPUT AND THROTTLES AT IDLE AND CONTINUED TO INCREASE RAPIDLY UNTIL CREW CUTOFF FUEL. SLIGHTLY PUSHED THE TUG. EVERYONE IS OK. APPLIED AND IDLE CONTROL RELAYS K10102 & K10103 SWAPPED. AFTER THAT, BOTH ENG NORMAL START PERFORMED IAW AMM 71-00-00-5-3 SATIS. NO ABNORMAL INDICATION OBSERVED. SYSTEM CONSIDERED SERVICEABLE.