Unless the 240 is vastly different than a 740, you do not have to remove the sunroof to repair the motor.

On a 740, it is under a plastic cover above the mirror. It drives the roof by gear, and can be closed in an emergengy with a phillips screwdriver. See if your 240 is the same.

Converting a 740 to a hand crank is fast and easy, I paid $15 for all the crank parts. I think that a hand crank is better and faster than a motor!

I suspect that the sunroof has some other problem.

I have found that my RWD Volvos are relatively easy to repair, but new parts are expensive. Keep in mind that most Volvos cost the same as Cadillac of the same vintage, and parts for a good car are made well and are costly
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3 8s & 2 7s 740,000 miles total