Upon start up, my 06 Road King has developed a "belt squeek" sound that appears to be coming from the left side towards the back end. The belt isn't spinning, so I don't think it is that. Is there anything else I can check? I can't hear it when moving, but i can hear it while sitting at a light with the clutch in. The sound remains even in neutral. Not sure what to check next and I really don't want to take it to the dealership yet.