It's a mechanical post 2015 rear mech fitted new 15 months ago to a C60. I've never been overly happy with the performance and took a few weeks to get it to be working as best as I could. It shifts up and down sprockets perfectly but was always a bit noisy around the jockey wheel area as though it wasn't quite correctly lined up. My feeling was the jockey wheel cage plate was a bit angled inwards towards the spokes but it was working though the worst sounding of my 3 bikes at that time. The other two were 2009 Super Record and 2011 Record. The bike was put away for the winter in September and it's been a very long winter in the UK with the weather only finally coming out of winter in April. The bike was kept indoors in a spare bedroom and had been washed and lubricated prior to that. All I did was wash and lubricate the bike again and put a quick spanner on all bolts and obviously nothing had moved. First ride out and small chainring/largest sprocket and the inner cage plate was notably catching the spokes. So much so I had to drop it to the next sprocket. It took me a couple of weeks of faffing around with it to get rid of that and still be able to change but clearly something was seriously out. I've done all the things mentioned in the above threads, yes the gear hanger was out a fraction and it's been checked not just vertical/horizontal planes but all round the whole wheel. There's nothing wrong with cabling as it shifts up and down with one click with no mis-shifts at all. It's just noisy. And here is my investigation and discovery....
Ok so this picture is small chainring/middle sprocket. I've taken the shot with the chain completely in line above and below the chainstay and you can notice a considerable drift inwards of the jockey cage
I've just pivoted the rear gear back on this which emphasizes the twist even more
This one is my 2009 Super Record and you can see how straight it all lines up. And yes this is perfect in function with just that nice ticking noise of the chain gliding through the drivetrain
The other thing to show is where the chain actually engages with the lower jockey wheel. You can see it's engaging on the outer part of the chain rather than the roller itself:
And this image
Whereas the 2009 Super Record engages nicely in the middle of the roller
I thought that was it really and reading through the above threads Graeme's advice was to contact the retailer and go from there. Fortunately I purchased mine from Wiggle and they have excellent customer service. So rather destroy a chain I removed the jockey wheels to get the mech off and leave the chain in place. This was where it got a bit more interesting! You can see from the two images below that the carbon jockey cage is actually distorted in both the horizontal and vertical planes. It does feel very soft and flimsy but I haven't took 2009 SRecord or 2011 Record ones apart to compare.
This image I've lined the top part vertical.
This one I've lined the bottom part vertically.
And putting the jockey wheels back results in this mess!
Top jockey wheel lined up vertical and you can see which direction the lower one is going and how that actually lines up fairly parallel to the mech body!
And now bottom one lined up vertical shows where the upper one is heading in comparison!
So all in all it's an extremely angry drivetrain in action and even spinning the cranks backwards sounds like a crowd of people grinding their teeth and it's no surprise why the chain having to fight its way through that. I've no idea what's gone on with it
. It's never been bashed, crashed or mishandled, hey it's my baby C60 and I keep it in the lounge in the summer and the bedroom in winter!! It's now gone back to Wiggle and will take 72 hours to get there so I'll report back further once I hear anything. 
