We have a 20 year old Bridgeport VMV800 with Heidenhain 370 control, yesterday we were unable to do a tool change. One of the breakers inside trips everytime that we turn the machine on and there is a 'low lubricatioon oil pressure warning' on screen.
We have tested the oil lubrication relay and that is okay, anyone have any ideas what it can be and how to test?Click image for larger version. 

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