I just collected a Fisher ca-2030 and i just wanted to ask if anyone knows what would the missing components be on the preamp-tone pcb inside the red circle.I suspect they're part of a more refined preamp- tone section of a different Fisher model, but i can't figure out which one would it be as mine is found in at least one other preamp, the cc3000 model but only the mm preamp looks the same in both models.