Well, you could ask someone to go out to the LNB with a DMM. They should read roughly 12 or 18VDC on the RG-6, depending on the polarization. Both voltages are OK to power the Low Noise Block down converter and the voltage difference is sensed to select CW or CCW polarization. There's obviously a ton more frequency division multiplexed stuff on that cable, but the DC is easy to look for. If they see the DC there, they might have a 2nd LNB connector they can try. I think most of the dishes have dual feeds. I imagine you already checked: Menu/Setup/System Setup/Satellite/View Signal Strength, for each transponder.