wet clutch one way and clutch housing

My2009 450 has been losing engine brake and most recently on our last ride together my girlfriend told me everytime she decelerated it made a grindy noise. I disassembled everything, and did test according to Yamaha procedures in the book. One way and clutch performed as they should, however wet clutch has about 6/10 mm of fiber left on the perimeter of clutches. Does anyone have pix of what inside of clutch housing should look like ? Are there grooves in it ? I don’t want to spend another $200 + for housing etc, if unnecessary, at the same time I don’t wanna cheap out and eat a clutch:gcrules:

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