Wanted:source for L-Tec heliarc 306 parts

[RatPwrd]

I have a L-tec heliarc 306 that I bought new in 1995.It is a GREAT welding machine and a real work horse,but I am having the first problem with it.It looks like one of the circut boards is out,I need to find a parts source,either new or some one parting out a machine.I would hate to scrap it because of one lousy part that I cant get!!.Any help??
Machine info;
Type# H-306HF
Part #680630H
Serial#C94G-53719
Thanks