I have a Doosan Horizontal Mill HP6300 with pallet pool. I am getting alarm 2161 quite regularly and nothing seems to fix it permanently. Resetting the machine will clear the alarm, but it seems that every 15-20 minutes of runtime the alarm appears again. The way lube tank is full and as far as I can tell the pump and gage are working right. Is there something else I should be looking at? Can someone here help me out with this issue? Thanks in advance.