Black stuff in clutch master reservoir

I have flushed the hydraulic fluid for the clutch several times. It stays clean for a while and then starts to accumulate black stuff in the reservoir. The clutch master is new. This leaves the stainless flex line and the McLeod hydraulic throwout bearing as possible sources. Both of those are 25 years old but I do not see any fluid leaks. It looks like something is coming undone. Can the 32 inch flex line produce this? Otherwise it would be o-rings in the hydraulic throwout bearing. The clutch is working perfectly. Any ideas? Thanks.

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12/29/229:03 PM

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