I’ve got TiVo with Comcast, no Dish Hopper, so not that familiar.
Did you try Yamaha support yet?
I know HDMI is the goal but optical or coax digital could carry DD 5.1 temporarily if the hopper supports one of those for audio, assuming you can at least get video to work from the hdmi.
Any luck on the SVS sub LFE input that needed repairs?