P,
Change the brake fluid if you haven't already.
Have them look very carefully at CV boots.

Maybe push for a thorough cooling sys pressure
test and very close inspection of coolant res., hoses,
fittings, etc.

Off the top of my ol'head.
GL,mD

PS, OT: after 5 1/2 years at the game, I managed to get my HDCP down
to 11.9/13 Home,(best ever), as we rolled on Sept. 1st. Then, I never came
close to playing to it for the entire fookin month of Sept, lol and shaking head.

So, when it rolled yesterday for "October", I'm back up to a 13.2/15 Home.
Ah...a comfort level I suppose. Back on topic.................