I have a Craftsman 113.298031 tablesaw. Recently it has started making a whining sound and the blade is easily bogged down. Previously the blade bogged down without the noise and I had to tighten the belt. This seems different. I took the belt off and the motor seems to run well by itself. I suspect bearings on the blade assembly but haven't taken it apart yet. Any suggestions before I get started? Likely just lube? Might need new bearings? Thanks for anything you can do to shorten the repair process.