In settings, tuner, or other settings.
You could check if this is a Horizontal proble, by trying a vertical option.
10818 Vertical DVB-S2 8PSK 23000 3/4
Try both Tuner A, and Tuner B, if that fails try a non HD transponder:
11344 Vertical 27500 DVB-S, both Tuner A, and tuner B, this should bring up Legend, amongst other channels.