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I think that about does it. I believe it's not an IMS because that was replaced with an upgrade 8 years ago (service history).
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Nope, that was the IMS flange being upgraded to a triple lipped seal from the original O ring design. This is a common misperception of service records.
8 years ago we had yet to release the IMS Retrofit, and not other product existed prior to our release. Porsche has NEVER offered an IMS retrofit, remember, they are the guys that said the bearing wasn't possible to replace.
Brown gunk is generally linked to intermix, BUT it can occur if the coolant is nasty. Do a coolant change and clean the tank, then watch to see if the gunk reappears.