Well folks, two Bernina repair specialists told me that my control was not repairable. I have ordered a pre-owned control from Franklins at a decent price. They are posting it out today.
A good tip that I didn't know and most likely caused the burn-out is when I stop overlocking to pause, my foot must still b still on the pedal just enough to put pressure on it to keep the electricity running through it. Franklin's man, Trevor, said that this is like keeping your foot on the clutch in a car constantly. I have done this very same thing sitting in traffic on a hill and within minutes destroyed my clutch. So, my bad. I have learned a useful lesson - again.