One way, use a optical bore sighter like a Bushnell w/arbors , Leupold Zero Point and etc.. Record the current settings ( turrets and grid) then turn them they're entire range, U-D, L-R. You should be able to turn them back to they're previous settings. If not its time to try a known good scope.
You can also check the mount(s) rings to some degree by pushing on the scope forward-back and diagonally and tapping on the turrets to see if it moves on the grid.
Bill
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