The "word on the street" is to go with improved FICM modules...but stay away from modifications that increase voltage. There are people out there who rebuild the things to last forever but they recommend staying away from voltages above stock. The findings have been that the increased voltages cause the FICM's to fail in other ways...whether it was from heat of whatever I can't remember.
By the same token others have claimed no trouble with Swamps 58V FICMS.