ibought a used sp250 from my boss a month ago and the machine has been working great. we are pipeliners and i know the machine was taken care of. went to tack a piece and no wire feed. investigated and the drive motor does not turn. made a few phone calls and: hooked 12 vdc to moter and it spins fine: checked voltage coming out of board :starts at 18v for one second drops to 9v and then steadily falls .1 v every second very reputable dealer says board is shot replace would cost 900 dollars half the cost of a new machine the board was already replaced 1 under warranty dont want to put a bunch of money into old technology? thank you in advance for any help