Thanks Nedkelly. Pre and post errors both show 0 per 0.5s, which sounds promising! SNR is 21.3dB. Doesn't seem to be an entry marked Return Path, but Return Power is 41dBmV.
One thing I have noticed on further investigation is that holding down the button on the remote slightly longer will sometimes convince the box to accept the command. Don't know what that's about either!
