Left side not moving as fast as Right side

That is more specific. You might check out this thread that has considerable discussion on the point. I have seen other cases where the cable on the left side drags and catches causing exactly your issue.

If not that I would remove the crumb tray and make sure nothing has fallen down between the crumb tray and the sides. From the rail to the corner there are parts of the gantry that can catch and drag much like that cable.

A less likely but possible is a broken stepper motor drive wheel as there have been a few where the rubber part cracks.

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