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Dear Dave,
Good a.m. and may this find you well. First and foremost, be sure to disconnect the negative battery cable clamp from the battery terminal and put the clamp in a plastic bag. This cuts power to the airbag sensor - under the driver's seat - and so prevents an inadvertent airbag deployment. At close quarters, this is very dangerous and it will be costly (about $1K). Once you have disconnected the clamp and isolated it, wait about 30 minutes for the capacitors to discharge.
Secondly, to work on the airbags, you'll need the Volvo Technical Manual. I believe that can be had from www.volvotechinfo.com.
If the problem is simply one of re-installing the unit, so that it fits properly, you should be able to do this. If the wrong unit has been installed - which is why I suspect sealants were used - you'll need to replace it.
If you want to source from a salvage yard, be sure to get the replacement unit from a recently-arrived car. The airbag is a mission critical part. Electrical / electronic parts deteriorate quickly when exposed to moisture, etc.
Hope this helps, at least a little.
Yours faithfully,
spook
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