A friend of mine asked me to look at his Dosan CNC lathe with Fanuc 10TF control. What I found was a undocumented system alarm on the main board. It is displaying a small "o" , not to be confused with the IPL mode indicator of a full sized "O.". I have done some searching hear and Google with no satisfaction. Has any one seen this before? The maintenance manual states any display not listed to replace the main board. Any help would be greatly appreciated.