Multiple warning lights after transmission service!

[dtc78]

Hi all, own a 2014 A6 Allroad. Required a gearbox service which i had done at my local Audi garage. On the drive home, I had multiple warning lights pop up. Air suspension/auto hold etc. Rang the garage and arranged to get it back in. They looked at it and said it needs a new wheel sensor (to the sum of £330). I explained this happened on their watch as the car was fine before it went in. Currently waiting for the manager to call back. Surely too much of a coincidence that it would go straight after being with them?? Any thoughts appreciated!! Thanks all. Dan 

Audi A6 Allroad 2014 85k mileage.