I have a Backline 210 that had bad solders from the factory on the front circuit board. I had those fixed but I'm still having problems with it. I'm tired of chasing these problems but I think just replacing that whole circuit board will fix everything. I sent an email to the GK parts department asking for a price on a new board over a month ago and another about a week ago and have gotten no response. Is it normal for them to take this long to respond?