The PADT article appears to be out of date. You no longer need to use MAPDL commands to extract the reaction forces from a random vibration analysis. They are available in the Mechanical UI.  Using *GET and FSUM is still valid, but no longer required.
The reactions are reported in the nodal coordinate system. You can use NROTAT to rotate the nodal coordinates from global cartesian to a local coordinate system before the solution, but it is not mathematically valid to convert the reactions into another coordinate system after the solution.
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