Turn it over (carefully!). I do not know this machine. Usually you can see a lever on the tonearm shaft hit a switch with audio wires coming out. Yours is perhaps mis-aligned. See if it looks like the lever has been forced past the switch and now working on the wrong side, or if the lever can be loosened and re-adjusted to hit the switch at the appropriate position.
what would make the muting switch engage with the arm in play position
and how can it be corrected so the table can be used? - its really a beautiful table
The Dual service manual describes how to adjust the muting switch.
https://www.vinylengine.com/library/dual/1009.shtml
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