I have a 2000 Ford Ranger 3.0L V6 Engine 79,000 miles on it. Something in the serpentine belt area is squeaking. The belt is relatively new with only around 10,000 miles on it. The other two belts lasted around 35,000 a piece before needing to be changed. The squeaking noise will sometimes go away when the belt finally warms up, other times it will not. Do you think it could be the idler pulley or the belt tensioner? Thanks!