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OK, the covers are out and the belt did jump quite a few teeth. About 30 degrees on camshafts (both).
Crankshaft Sprocket key seem to be OK, belt is clean and dry (45k on it), the tensioner was in place and is not obviously broken.
I wish I knew what caused it to jump and how it did it. Anything to look at in particular? When I get back to the car, I will check the belt for bad/missing teeth, but other than that I have no idea what to suspect...
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