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Most of the factory produced documentation that was around for the early 986 cars was never updated with any of the many updates Porsche put out. So while good, there are errors.
And for later cars, there was no printed repair and diagnosis manuals, just the online info for which you had to be a dealer or have really seriously deep pockets to purchase.
About 2-3 years ago on the forum someone really went into the systems you are looking at and posted theory and testing approaches but on which forum and who it was ... I'm too old to remember. Search is you friend.
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