As far as I am aware there are no end user serviceable parts. if air is leaking from where you say it could just be a side effect of air leaking from the bag and escaping where you see it.
You can buy refurbished parts from the likes of Arnott rather than OEM if you need to save a few dollars.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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