It was by a couple of posters -
http://www.dslreports.com/forum/r23786986- //
http://www.dslreports.com/forum/r23787134-
Unsure what it ended up being, worth noting that he has a DOCSIS 3 modem but is not provisioned to bond channels, and that they are using US DOCSIS not EuroDOCSIS so more tolerance to noise, 6MHz wide channel instead of 8, and 32dB is borderline instead of being plain rubbish.