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If the switch is indeed built in, the two leads may be for two receivers. The best way to find out is to make a guess, then do the "switch check" and it will tell if you have a switch, which one, and if it's working. I have an older model dish 500 with two individual lnbs mounted side by side with a little different angle on each one, separate leads, and a diplexer switch - two leads in, one lead out to the receiver.
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