As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 2822, FLIGHT IDLE STOP OPEN LIGHT ILLUMINATED AFTER T/O. AIR RETURN TO DTW. MAINTENANCE RESET F1 STOP, OK CHECK NOT GOOD AT THIS TIME. WITH POWER LEVERS OFF, LT POWER LEVER GOES BELOW F1. MAINTENANCE REMOVED AND REPLACED CONTROL QUADRANT. ALL GROUND RUNS CHECK OK.