P16-M Problem

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I have a problem with one of my P16-M mixers. The problem I am having:


1. Output of the mixer is mono only.


2. Putting a channel pan (any channel) in the center turns the channel off.


3. Panning the signal either direction gives volume, but mono output only.


Otherwise, the mixer appears normal - no unusual lights, etc. I have reset the individual channels, as well as the 'main/solo/mute while powering' reset.


Does anyone know of any other reset options that may be done on these? Thanks.