I would recommend that "sitting on the bucket" process.
If the windings are good and there are no shorts to ground, the idea that this is being caused by the compressor is possible, but not great.
Most likely, the reference to chattering (an intermittent condition in the control circuit that causes the contactor to pull in a drop out rapidly) is the real cause.
Most of the time, I find a defective pressure switch/ loose wire nut/terminal connection/worn thermostat micro relay that causes chattering.
I have never replaced a compressor yet for this condition that checked out properly with the meter.