Some months ago I serviced the above mentioned machine, it used to show a couple of spindle drive related alarms and could not function.
I serviced the Mitsubishi FREQROL FR-SX spindle drive, replaced two power modules as well as some driver transistors and electrolitic capacitors, right after that the machine started working fine. Now that I have some spare time, I decided to upload a video showing that service, hoping it will be used as reference/help by somebody out there.
"http://www.youtube.com/watch?v=nEw4sDQA0Bc"]YouTube- SOLVED...Mazak VQC FREQROL Spindle drive repair test
I just gotta say it's very generous of you to take the time and effort to put this up.