Buy a used pump or repair kit on eBay. When you get it, you'll need to do the following:
open the trunk,
remove the CD player and bracket from the left side of the trunk
remove the hard plastic trim from around trunk opening and to the left of that. remove enough hard plastic that you can pull the hard molded carpeting away from the left side of the trunk.
directly under the antenna you'll find a brown foam block with wires and vacuum tubing going into it. gently remove the foam block, open it, and there you'll find the pump.
gently remove the 3 wiring connectors and 2 vacuum line connectors, and install them all on the new pump.
if you bought a repair kit then take the pump to your work bench and install the parts.
install the pump and all the trim parts back the way they were.
reprogram the pump to recognize your remote, if necessary.
in the boot on the drivers side.
How to replace power steering pump on Audi
That pump operates the pneumatic central door locking system.
Have a pro go at it, PITA to replace.
bearing went in pump you need to replace the pump now
A new central locking pump is needed.
First remove the fuel tank then remove the pump assembly locking ring then remove the pump assembly.
electric fuel pump remove or lower fuel tank remove locking ring unplug electrical replace pump
electric fuel pump remove or lower fuel tank remove locking ring unplug electrical replace pump
A pump that locks.
In the boot on under the carpet on the right hand tail light
Leave it to an Audi tech, there are many things that have to be removed. If you are doing the water pump, you may want to have the timing belt, rollers, thermostat replaced as well.