Measuring again and seeing what the 10 volt rail does during transmit, I see that it drops to about 9.85 volts on the rail and 9.37 or so at the input to Q508. This gives something like 9x10^-7 amps leakage through Q508. The spec sheet for bss123 says that's out of spec as it should be 10x10^-9 amps of leakage even at 20 volts, but I'm not sure that that small amount of leakage would have been enough to blow up the Mux ICs.?
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I may change Q508 as well just to be safe.
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Greg
