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I'm just about done re-building my 1998 S90 with the B6304 engine. My timing belt never broke. what failed was the guide bearing for the timing belt, causing the belt to slip about 12 teeth on the cam gears and damaging the valves. this can occur if the water pump bearing, the tensionior bearing, or the hydralic tensioner itself fails. my head rebuid was $325. plus $100. for used valuves for them to re-maine and install. then anothe $120. for a head gasket kit, plus 14 new head bolts, etc. all my intake valves were damaged. I'm thinking when it's all said in done I will be in for about $900. and a ton of labor. this is the first time, I'm doing this, so my learning curve was steep, even with the Volvo and Chilkton manuals. I speanf a lot of time making my own special tools, My MIG welder came in handy. you need a compression check. It's a simple pressure gauge. I also rigged up a properly threaded tube, that i could screw into the spark plug hole. I put a balloon over the end. Put a 30 mm socket on the crank bolt and manually turn the engine over clock-wise. if you have compression, the balloon will inflate and de-flate and also have vacumn on it. I agree, a serp. belt breaking is highly unlikly to break a timing belt. get the T-belt cover off, inspect the T-belt, manually rotate the engine with the socket on the crank. you could also take the plugs out and press the palm of your hand over the 1-1/2 inch. access hole to the plugs, and seal it with your palm tight. Then turn the engine over by hand. you will feel the compression on your palm.
The shop should not have problem letting you do this.
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