I think Bristol should be able to keep your casing and re-build. As they did with mine. Surprised if not..
And not wanting to hi-jack the post and turn it into S8 common faults but if the engine does come out then it might be worth doing some rear hoses as a preventative measure. I have a failed oxygen sensor (pre cat) and apparently that is an engine out job too. Just because of a poxy sensor that's failed!
If power steering pump was going, I would expect you to get some noise or light vibrations from the steering. So maybe you don't have to worry about that - unless the engine is out anyway for other reasons.
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2012 A6 3.0 TDI Avant, Silver, 7 Spd STronic, Bose, ACC, Advanced Parking Camera, Power close / open tailgate, Side and Lane Assist, AMI & Jukebox, Adaptive lights with corner and high beam assist, Through load with ski bag, Audi pre sense plus, sports diff and sport suspension, Panoramic roof, Storage pack, MMI touchpad and VIM, etc. Oh and now retro fit rear seat entertainment 
2019 BMW I3. Heat pump, Winter, professional and comfort packs, Harmon Kardon, autopilot
2022 Mercedes EQC 400
Previously: 2009 S8, Silver, B&O, Ceramic Brakes, Advanced Parking Camera, VCDS
2008 A8 3.0 Tdi sport, B&O
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