These reservoirs are common for failing after time, however I would recommend bypassing internet diagnosis for that mate, have ot pressure tested, it wont lie. If you fill it bleed mate, it has to go somewhere, hence the recommendation for pressure test. If it is the res they are cheap as chips.
Cheers
Jmac
Alba European
Service, Diagnostics and repairs. Mobile Diag available on request
Audi/VW/Porsche Factory trained tech 25+ yrs exp
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