Dear Laurie M,
Hope you're well. The SRS components are good for the life of the vehicle. Volvo changed its guidance as to SRS component working life from 10 years to 15 years and finally, to "life of the vehicle".
There is no way to test SRS components. Rather like a hand grenade, the only way to test is to expend it. Once an airbag deploys, it is expended and has to be replaced, along with the wiring harnesses and the module.
I'd replace the following parts: (a) ignition switch; (b) park-neutral-park switch; (c) heater hoses (use Volvo brand only) and heater valve; (d) ignition amplifier; (e) fuel pump relay; (f) fuel injection relay. (b) is time-consuming: I just did one. (c) is also time-consuming. Changing relays takes a few minutes.
Hope this helps.
Yours faithfully,
Spook
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