NASHVILLE, Tenn. (AP) — With a year-long federal fraud investigation looming over it, the huge truck-stop chain owned by the family of the Cleveland Browns owner and Tennessee’s governor is doing some housecleaning at its highest levels.

Several top executives at Pilot Flying J, including the president, abruptly left this week, more than a year after FBI agents raided the Knoxville, Tennessee, headquarters of the nation’s largest diesel retailer. Ten former employees have previously pleaded guilty to helping cheat trucking companies out of promised rebates and discounts.