Directv reciever with off air antenna support

My Hughes HR10/250 has died. Are there any HD receivers left that still support off air antenna and DVR? The Directv tech told me to buy a used HR20/250 but I can not see any online (used or new).

Maybe I can get mine fixed, the input for LNB1 is corroded - the tech told me water migrated up the line to ruin my receiver! I can see the corrosion, maybe I can look inside and fix myself?

Are there any good choices left for me?

Any ideas welcome

thanks

Phil