Hello distinguished associates! I'm having a strange issue with my Marantz SR7007 receiver and that is the center channel volume level is suddenly greatly reduced, almost to the point where the dialog is hard to hear and I can't figure out why, other than perhaps that amp channel is going bad or some problem in the processor is having an effect. I have not made any adjustments in the menu so I thought perhaps that one of you may have had this same issue. I would appreciate any help or advice. thanks!