Can AC sanitizing cause a problem with airbag? 2018 Prius 2 eco

I recently took my Prius in for a regular maintenance. They rotated and balanced the tires and sanitized the AC system. That's it. They informed me I could pick it up and when I got into the car there were a series of malfunction notices popping up on the screen that were definitely not there before. The associate acknowledged that he did not see them when I dropped the car. They kept my car and gave me a loaner. The next day they called me and said they would need to keep it until Monday when a senior technician could look at it. Today, they informed me that they need to start with "replacing the SRS Airbag ECU Assembly" and that it would cost $1100. Start with? I have asked to talk to a manager. They have not called back.

 

My car is at a Toyota dealership