I also agree that the oils should be changed and that Volvo is probably being lazy / wanting it to break so they have to replace it.
As for getting the pump off there is a guy on youtube who has managed to do it on a volvo
https://www.youtube.com/watch?v=uZNC06Z7imQ&t=1093s
I intend on doing it this way to get as much oil out as possible, but I need to have a look to see if I can get to the filter and pump on my xc90 with out removing the shaft and exhaust, it will be a job for over the next few months as I need to replace the windscreen, front engine mount (this weekend), and potentially an injector which has a high Fuel correction rate at twice the recommended limit. I have not looked at the return rate yet, but it did have a miss fire fault code on that cylinder the other day but it has not come back, it just runs a little rough at idle especially on cold startup.
The joys of trying to maintain a car, anyway thanks for your help guys I shall be adding this to my service schedule every few years.