Downstream SNR sucks the botty, upstream transmit is maxing out. Those of you who've been here a while shame on you, I did a thread on acceptable power levels and this chap is well outside them!
This link is heavily attenuated, at a guess no noise just attenuation making the wanted signals too weak, needs an engineer to come and check it out.
Tech support were spot on. Can't complain about this, they could have made you go through a load of scripted PC checks but didn't