With the C-axis in the home position and rotate the B-axis to -90 degree.
Place the indicator on the front face of the test bar about 4" away from the spindle nose and mark the position of the indicator on the test bar with a felt tip marker, and set the indicator to zero.
Rotate the B-axis to -45 degree position  and without moving the table in the Y-axis jog the indicator back onto the felt tip mark. Record this value.
Continue this process for all other positions , , &  and record their measurements from the indicator.
NOTE: All positions are in 45 degree increments.
After taking the measurement at position  rotate the C-axis 180 degree's and repeat the previous steps of marking a point, and taking measurements at 45 degree increments.
There will be two measurements at each location, the difference between the measurements at each location divided by two is NTE 0.004" (i.e. Run 1 - Run 2)
Check the warning in the next step before attempting any adjustments.