You couldn’t make this one up. One of our customers had parked their car up for winter and during this time, some mice had taken refuge in the airbox. When the customer came to use the car again in the spring and started up the engine, some nuts that the mice had left behind got sucked into the compressor side of the turbo, and this was the resulting damage to the compressor wheel!
This isn’t something that you’ll find in any manual, but the moral of this story is if you have stored your vehicle away for winter, make sure you check for signs of mouse ingress and clear away any debris before you start it up again!!