I can also suggest a very good mechanic in Worthing if you get stuck. He's not a Volvo specialist, but has done a lot of work on my past and present ones (70s-00s models)
Sounds like you have a handle on it though.
P.s. there is a thread somewhere on the forum where you can request your post count to be altered to enable PMs to be sent
EDIT: found it
https://www.volvoforums.org.uk/showt...99800&page=147