Kenmore dishwasher making buzzing noise

[NoSmoke]

Hello all, I have a Kenmore dishwasher (model 665.13722K601) which works as usual but suddenly started making a buzzing noise when the circulation pump/motor is running.  I removed the pump/motor assembly and ran the motor on the bench - same buzzing noise but, the buzzing noise stops immediately when power is removed (and the motor is slowing down).  The motor bearings feel tight and smooth when turned by hand so I;m thinking the noise is electrical in nature.

Question:  could this be caused by a bad motor capacitor?  The capacitor looks normal (no leaking or decolorization) but I don't have any way of testing it.

I'd much rather replace just the capacitor rather than the whole assembly but am reluctant to try one on spec as the things alone are around $85.

Thanks, any help appreciated.......

[NoSmoke]

Just wanted to add:  Remembered my multimeter has capacitance measurement so checked the capacitor and it reads 23.6 microfarads vs the specified value of 23.5 - so it looks good.

Then tried disconnecting the capacitor while the motor was running and the buzzing noise pretty much vanished.  So, what does that mean?  Bad motor winding?  Something else?

[NoSmoke]

After much effort, found the problem - piece of broken glass in the chopper blade enclosure.

Thanks anyway...