I'm not sure if it's worth repairing, given how old the VU+ Duo is, and it's limited hardware.
I have a telecentre, reasonably local, who have repaired a couple of DVD recorders, for me, at a reasonable price, and they first work out a price, to see if it's worth the repairs, might be worth checking, if you have any local electronic repair shops, who will test your receiver.
Personally I would consider a newer receiver, capable of doing so much more, including Kodi.