What outcome does your husband want? Not sure what was changed...if it was just one note, the more important thing is what is in the MEB Narrative summary. That document should be accurate, if it is not, then that is a problem. But, guarding would only be an issue if the ROM was such that the guarding results in a higher rating. Here is the relevant portion of the rating criteria:
Forward flexion of the thoracolumbar spine greater than 30 degrees but not
greater than 60 degrees; or, forward flexion of the cervical spine greater
than 15 degrees but not greater than 30 degrees; or, the combined range of
motion of the thoracolumbar spine not greater than 120 degrees; or, the
combined range of motion of the cervical spine not greater than 170 degrees;
or, muscle spasm or guarding severe enough to result in an abnormal gait
or abnormal spinal contour such as scoliosis, reversed lordosis, or
abnormal kyphosis 20
Forward flexion of the thoracolumbar spine greater than 60 degrees but not
greater than 85 degrees; or, forward flexion of the cervical spine greater than
30 degrees but not greater than 40 degrees; or, combined range of motion of
the thoracolumbar spine greater than 120 degrees but not greater than 235
degrees; or, combined range of motion of the cervical spine greater than
170 degrees but not greater than 335 degrees; or, muscle spasm, guarding,
or localized tenderness not resulting in abnormal gait or abnormal spinal
contour; or, vertebral body fracture with loss of 50 percent or more of the
height 10
If the ROM results in a higher rating, then this won't matter. If it does, then it should be rebutted.