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dan
If there's not a 3 digit number when you run the Garmin "calibrate" command (you're actually zeroing the offset) then it's returning a hub ID, which will be the same every time. If the torque value moves about constantly (after zeroing the offset) rather than staying at zero, then you have a dead hub. Otherwise it's 99% likely to be fine.
To find out more information about your hub you'll need a Joule computer, either the LYC or one of the newer ones. A 3 digit number that's not close to 517 doesn't mean it's dead.