Steering suddenly difficult – what cause?

Moin, with my XC70 EZ 09 D5 GT AWD 221 tkm since today suddenly the following problem: car parked in front of the supermarket. When driving off a more than heavy steering. The servo support is definitely no longer available. I then tortured myself with the car to my nearby workshop. Error messages were only shortly before the workshop. Battery symbol and red triangle. No further messages. Here in the forum have reported some of the failure of the servo pump. The battery symbol makes me a bit stubborn here. Battery is quite new and can not actually be empty. SH ran smoothly in the last few days and today it was only about 100 km over the AB. Greeting Thomas