Air bag service light on after fuel pump replacement
 

Hi all,
today I had my fuel pump replaced.
The mobile mechanic dismantled the full interior of the car xv90 2006 7 seater. from the second row of seats all the way to the tail gate.
​​All plastic,everything.

Well after they left I noticed the air bag service is staying on.
I didn't have any issues with it before today.
I have done some research online and have found a few things it could be but I'm not sure.

I found it can be an issue with the seat belt tensioner, which they removed.
Or because they didn't disconnect the battery when installing the fuel pump.

Any help would be great before calling them back.
Thanks