Capacitor,Run

A good capacitor should not be swollen, and will sit flat on a surface.

Run capacitors match the induced voltage created by the motor to lower the current draw by the motor.

They fail mainly due to heat.In most cases the capacitor will have a bulge on top and bottom.Just set it on a flat surface and note the way it stands.This bulging is caused by the expanding gas inside which will cause the fuse links to break and fail.

Capacitors tend to have a residual charge after removal of wires and should be handled carefully.