So, it looks like the guibo and universal joint are OK. Didn't remove from the car but took some pics and video of the CSB movement. Really just need a practiced eye to tell me if the CSB has too much movement or not. I also noticed the "grease dirt" line around the universal joint, but the joint itself did not look dry.
On a related note...if I want to remove the Guibo, do you put the car in neutral to rotate the driveshaft to get to the upper Guibo nuts or just an angled wrench? Bentley Manual isn't specific as to the method, just that you undo the nuts on the transmission side...which are of course, hard to get to...
Center Support Bearing.
Videos of movement:
Guibo.
Universal Joint.
