Hi Piolaxo -- I did try switching tubes and got no change. I kept investigating and at one point switched out interconnects completely. I had earlier switched interconnects at the DAC side and the low channel stayed on the right. Dumb mistake, as that cleared the DAC as a source of the problem but not the interconnects. Turns out the low level in R channel was due to a bad interconnect cable. I have no idea why the balance/input problem coincided with the bad interconnect but can only assume it was a coincidence. Only problem now is the unit still does not do a reset. But can live with that as otherwise the unit is fully functional now.
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