Dropped the sump yesterday and there are some metal particles in the screens not as much as I have seen in photos posted here. My sump looks totally different to any I have seen on here. Spinning the back wheel with the disc pads retracted does not create any noise from the damper area only when you rock the wheel back and forward there seems to be a lot off backlash and clunking. Also I can lay under the bike and see the damper, I got someone to rock the back wheel and could not notice any major lateral movement in the damper.
I am still going to rip it apart as I have made all the tools to do the job, and I feel it is not good to have a sound like an empty tool box being dragged along under your bike!!
It is not a hard job just bloody time consuming and it will take me longer as the temperature here yesterday was 45°C so I could only do a bit at a time.
Thanks for the input guys, will ask the bearing shop if they recommend standard or C3 bearings.
Will keep you posted and add some photos if I can figure out how.