Hi Adam,
I've got a 940 Turbo and a have had a hint of a blowing gasket at manifold for a while.
I traced it following some great threads on this forum, used a bit of Fairy Liquid in water sprayed around manifold.
As it gets so hot with the Turbo, and access is not great I used my workshop vac with hose plugged into the 'blow' outlet and taped into rear of exhaust pipe, leaving a bit of a gap.
This allows you to do check with the engine cold and not running, mine had two leaks, these seal up once warm though.
I did get all the bits including new genuine Volvo studs and nuts, not cheap. But on looking at in detail the Turbo needs an oil feed pipe that apparently can be tricky to get sealing right. Hence I've left it till I need to do something else in that area.
Good luck, and hopefully yours will be easier to access.
Cheers
Steve
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