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Yesterday I removed the discs and, sure enough, the friction discs are severely worn. Here we can see by the shallow grooves that the disc is about half worn.....
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......and here's the flip side of the same disc, which is completely smooth. Someone's been doing some hole-shots with this clutch.
The discs are not warped and there's no indications of excessive heat, so the steel discs could be reused if needed.
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But I'm replacing the discs with a new Barnett clutch set — friction and steel discs (this photo shows the Barnett friction disc with the OEM steel plate).
Clutch swaps are straightforward mechanics and everything went together smoothly — and my clutch is back to normal.