To test where the break in power is, plug the machine in and squeeze the foot control full-throttle. Wiggle the cord where it goes into the machine, where it goes into the foot, and where it goes into the wall. If wiggling the cord brings a burst of power, then you probably need a new cord. If the break is where it goes into the wall, you can replace the plug end pretty easy. If not, You need to figure out if it's the foot control or the motor. If you take it to a Viking dealer (or any repair shop), they should have a cord to test your machine with. I wouldn't think they'd charge to just plug your machine in with a good cord/foot control and test it.