I have an Exmark LHP23KA505 with the Triton deck that has developed a whistle while the blades are engaged. I know it's got to be a spindle or pulley, but how do I tell which one. In the past, on other mowers I would remove the belt from the idler pulley and find the spindle with resistance. I did the same on this mower and they all seem to be spinning just fine. All the pulleys seem to be spinning normally as well. Though, the whistle sounds like a tea pot on the stove.