Hitachi Seiki HG400III. New to me. control comes up and everything looks normal until I press the standby button. The hydralics start and run for about 3 or 4 seconds then I get a NC communications error A11.7(D711.7) and sometimes a SL bus error. There is also a red light (SEER) on the FIOSL board that comes on at this time.

Anybody have any Ideas?

Thanks