Securing screw for chuck is Torx t20 LH. Measures 6.2mm on thread, 5.7 on shank. Not a set screw.hex head - it had a rounded rather than flat bottom to the head.
Found a Dewalt service sheet that implies it's always a bit stiff, as there is a special fixture, which involved removing part of the drill initially. IIRC Tighten screw to 9Nm and chuck to 45Nm.
A bit reluctant, but a soak in lubricating oil over night loosened it up. Put back without thread lock.
Didn't remove chuck. Cleaned up the jaws, and oiled as much as possible. One stiff point around 8mm went away. Hopefully this will cure the slippage.
Looked and didn't find any videos, but it looks like the way into the chuck is to hold the area just below the knurled part (probably need to remove chuck) and unscrew normally. Watch out for falling ball bearings!
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