Pablo
I've rebuilt alot of those swords in my time and currently sell rebuilt swords on ebay and I've been fortunate enough to have a few members of bimmer.info buy from me.
I still believe you have a sword problem, there are many areas of the sword that can fail besides the mosfets. There are actually 37 other components on that sword that are susceptable to failing and I believe your problem lies with one or more of them.
David
EuroElectric