S6 Quattro Sedan V10-5.2L (BXA) (2007)
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Starting at bottom, pry grip channel for backrest cover out of guide at backrest, using e.g. an awl - arrow -; lightly press together backrest
upholstery in order to release backrest cover.
Disengaging flap for backrest bolster inflation adjustment
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Swivel backrest bolster inward - arrow A - and disengage flaps - 1 - for backrest bolster inflation adjustment at retaining bracket - 3 - of backrest -
arrow B -.
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Disconnect pneumatic hose - 2 - to backrest bolster inflation adjustment.