I'm not sure which pcb you are referring to. If the 75 watt combo pcb is the same I will look into that one for sure. I was looking at the hd150 pcb because it has the same setup just doubled. Either way, if it doesn't work, I'll be writing line6 products off for good. Maybe my money will be better spent with a company that will provide parts for even the most vintage of products. It would be nice if line6 could just give some advice instead of "send it in and MAYBE we'll fix it or MAYBE NOT." Like I said. I'll reply back to this post with my findings. Good luck yourself Spidercrack.