Two channels that seem to be cross talking

I have two channels that seem to be cross talking. One is unresponsive unless the other is active.

Brief summary:

Channel 134 does not respond to commandsfor intensity or other parameters.
Bring up Channel 135 first, then 134, and Channel 134 can be controlled.

Take out 135 and 134 also goes out

There is obviously a link between the channels here somewhere that I can't figure out.
.
Thank you.

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