help needed with 904

It looks as if it may have been Emery cloth or something but it feels good
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What I have seen so far is normal "needs a soft parts rebuild" stuff.
I call steel plates soft parts because I believe they should always be replaced with new clutch discs.
You know, the indication I see is that the throttle pressure stuff might not have been hooked up or not adjusted right, because that clutch you showed is what burns up first because of low TP. (like when a member says he doesn't have the kickdown hooked up, and we warn them that it will burn it up)
That is what it burns up.

Looks like a basic rebuild to me, as long as the sealing ring lands are ok.
You need to check where the rings run inside that aluminum where the park gear hub goes as well. (called the governor support)

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