After my ride in Indy and the mechanical I suffered (being the second time I had that particular problem recently), I decided I needed to replace some worn parts…particularly my 9 yr old XTR M952 rear derailleur. It still “works”, but I’ve had to bend the cage twice recently. It’s on its last legs, I believe.
The Bike Shop in Nac had a NOS XT Shadow M772 rear derailleur in stock. Not sure how old, exactly, but it’s probably been on the shelf for 5yrs or so. I negotiated a deal for it with the owner and went home to install it.