There are various service sheets available & linked on this forum - you need to search for them though.
One of them - that I keep using myself - is linked in this thread:
https://www.volvoforums.org.uk/showthread.php?t=168739
Some will say you should not rely on them as they are/might be obsolete. For me it's as good as it gets.
You can also browse this thread for a bit of an enlightenment:
https://www.volvoforums.org.uk/showthread.php?t=272425
And try using Volvo service price indicator that's available online.