I have a Brother TC-31A with A00 control that is randomly throwing alarm 6311: H Pre Coolant Err 1. Description says "high pressure or filter pump overloaded". The problem is that this machine doesn't have high pressure or through spindle coolant. It has two pumps: flood coolant and washdown. Neither of the overloads for these pumps are tripped when we get this alarm. Yamazen says possible I/O board trouble. Does anyone have any ideas what could be going on or how to diagnose the problem? I'm pretty good at tracking down problems on Fanuc machines, but I'm a little lost on Brothers. Thanks!