Getting an occasional noise from the steering. Like a humming but it lasts for just 1 second when turning at lower speeds (although at higher speeds it may not be audible).
Feels mechanical, like the pump is struggling or having to work extra hard. It's just a hum, nothing more. No creaks and no change in steering characteristics.
Had a look for a dipstick to see if it was low but no sign. My memory suggests these cars might not have one.
It's a A3 TDi 170 Quattro.