I have a Cincinatti Milacron retrofitted with a Fanuc 21 control. It recently started throwing up the 411 alarm on X whenever it was taking a cut. Checked the motor it megs out fine and ballscrew turns pretty easy. While trying to get it to run the other day i could smell something burning. Powered down and opened cabinet and seen smoke coming from one of the boards. It is Siemens 6sc6100-0ga00 board. Two diodes (v379 and v380) are crisp. I bought another board haven't installed yet for fear of burning it as well. What could cause this? Bad Cables?