All Honda's use computers (SRS modules) to control the SRS system. They all have internal battery back-up's to store the trouble codes if the battery is unpluged. Most times it takes several days with the battery out to clear the SRS computer and that's not always successful.
The Airbags are not servicable. There is no gas that can be refreshed.
If you can find a shop other then the dealer to run a diagnostic on the computer that would be a good thing. The machine isn't cheap and I know the body shop I ran for three years didn't have one. We just took them to the dealer to be reset or diagnosed when neccessary.
They charge the average consumer one hour labor to have it diagnosed and/or resest so it comes out to about $57-$65 depending on the dealer.