For several years, never a problem. This weekend, the left and right XLR outs AND the left and right 1/4" outs are putting out NOTHING. The recording DI out (which I send to the board) works just fine. No issues with the knob settings, I tried everything. Of course, I'm sending it off to the shop today and expecting to pay a hefty premium for having it looked at before next weekend. But, any ideas as to what the problem is would be appreciated.