Hi. Was just finishing the lawn for the year and heard a whining sound that is only present with the blades engaged. Reminds me of bearing noise. Touching the pulleys, none are warm to the touch. Looking at the exploded parts diagram I see no Zerk fittings for lubrication on top of the pulleys. I'm not sure how to better localize the noise source or to lube the bearings assuming is is coming from the blade spindle. Any suggestions? Thanks!