You are getting good technical advice from some Brickboard 960 experts in this thread-- let me offer you some practical but non-technical advice-- your dealer is sending you a message that they don't want to work on your car anymore unless it is a sure thing for them that they will make money on the job (the financial risk is yours, not theirs). They are suggesting 6-20 hours of labor! Frankly, you don't want them working on your car anymore either-- dealerships are set up to service new cars and their viability depends partly on their service business.

The more appropriate approach for things that aren't DIY is to find a good independent Volvo-only shop. These shops tend to be owned or staffed by people who cut their teeth in dealerships a decade or more ago who have set off on their own. They probably serviced our cars when they were new and know them well. Some even keep parts cars and can supply you with good used parts where appropriate. There are 5-6 of these guys who are regulars here and their knowledge is impressive. In most cases you'll get better service from one of these independents and you don't have to talk to (or pay for) a "service advisor" in a white lab coat.

Good luck!