I have a series 2 interact 2. I have rebuilt the failed dc voltage regulator. I now have both the unregulated 29-30 volts dc and the 24 volts regulated....but the dang MDI control (Heidenhain 151) is still not happy and wont let me past this error message....what am I missing....please list any thoughts you have on what would cause this error prompt if not the regulator.