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That's just clear coat. Watch a few UTube vids and just mask and don't remove. May create more problems.
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I don't think that money is out of line. There's a bit of work just in the roof trim.

Might be old PS fluid, might be a seeping water pump, might be from the oil cooler, there's really nothing other than that to leak. I see folks write about RMS issues but in my estimation those are rare and most are misdiagnosed PS pump leaks. Timing cover is seeping versus outright leaking, that's ...

Maybe need to adjust the sunroof. Here's a calibration post here- https://www.matthewsvolvosite.com/forums/viewtopic.php?t=44603 , I do this upon occasion. Adjustment itself is here: XC90 Sunroof Adjustment_1225.pdf ,you should calibrate after you're completed for a final visual check on the adjustm...

There are different size batteries that fit in the tray and under the cover without modification. The smaller stock battery is terrible for even using the radio in ACC position. Get the largest AGM battery that fits. On my '09 XC90 it's H7, on my'14 XC90 it's H8. I've read that Walmart does a straig...