I have the fix for you.

First unplug the DTH335
Second throw it out the window. (will save you alot of time and effort)
Call Sky and ask for a pace.

Be happy.

I tried for a month to get the 335 working with the Tivo and got no where, Sky even said that they had customers that couldn't even get learning remotes to learn the codes and control the 335. I threw in the towel and swapped out for a pace decoder for $25. They work with the factory pace settings allready in the Tivo.