I was able to eliminate the same issue by installing an 18 volt light bulb right at the outputs of the TIU. Even though I have MTH Lock-ons, with the 18 volt bulbs at the tracks, I still had the soft key echos. It wasn't until I put the bulbs right at the output of the TIU that it went away. I think the Rev L was supposed to eliminate the need for the magic bulb, but I would try the bulbs anyway, if nothing else works.
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