Help for MOTOR 2.2 Kw and control board optimum BF46 milling machine

[EddyCurrent]

Happy New Year !

See the circuit board mounted on the end of the motor, make sure it goes back in exatly the same position. You can see it has slots to allow rotation.
If you are using a 500v Megger type insulation tester keep it well away from the same circuit board, only test at the windings (U, V, W), if it's just a multimeter that will not be a problem.

On the main board there is a white connector with 2 white wires going to it, beside it is a 3 leg component mounted on a small vertical heatsink, well the legs on that do not look good, it looks in fact like someone has changed it before. Maybe this is a component that blows often ?

There is a rectifier with GBU 12G written on it, this could also be causing the problem.
http://www.datasheets.pl/bridge_rectifiers/GBU12A.pdf