TOV - Crosstalk on clean channel?

[VertigoCycles]

I have a trem-o-verb that's relatively new to me, and in the short time that I've owned it, I haven't had the opportunity to play it often, or loud. The other day, I was playing my tele through the clean channel and there's some low level background fuzz like it's playing through ch3 at 10% of the volume of the clean channel. I know the PCB is packed pretty tightly, so crosstalk might be a possibility, but before I pull the chassis and start poking at things with my scope, I thought I'd ask the knowledgeable folks here to hopefully save a little time.