Started on the long journey to get a new clutch and pressure plate in. First discovery was oil all over the flywheel cover. That is likely why the slipping.
Drained the transmission. Got the rear cover plate off the tranny to expose the u-joint and stopped. Don’t see how to get to it. I put up a thread in drive chain to get some guidance.
When I figure it out I’ll start again.
This issue is discussed in the Driveline forum here.