I recently acquired a used Agilent 8560E in very good condition. It works as described in the initial checkout section of the user manual. I do see one possible issue, however. The alphanumeric characters on the screen vary in brightness, to the extent that some lines in a single character are brighter than others. Perfectly readable, but probably not supposed to look like this. Because this occurs at many positions on the screen, it doesnt seem to be a CRT issue, but maybe something in the character generator. Any suggestions as to where to begin looking?