What are the coloured sections on the ballscrew? Grease? - Yes they are

Any chance of a couple photos showing the carriage assembly? - I've taken a few photos this morning, lots of the ball screw in the area where it gets stuck. Hopefully these will be helpful:

https://drive.google.com/drive/folde...AM?usp=sharing

I just started to remove the bolts then realised I need to take the whole thing apart (the metal surround/case). Sadly, I've got way too much prep to do for this job next week so I've not got the time right now. I'll have to come back to this after the job is complete.

Thanks everyone. I'll post more once I have time again