50 hp 460v quantum regen drive. showed up. blown 150amp transistor fuse in drive. disassembled drive. 8 of 10 bus caps nfg. i replaced all bus caps. tested all 7 igbts. they are good. tested the 3 resistors in the drive. good. funny thing i noticed. parms in dsp went back to default. put old parameters in drive. turned on. again. lost a big drive fuse. where would you go next? im thinking of replacing dsp board, then disconnecting igbt control harness in case something is turning them on and keeping one igbt on. btw. motor and contactor are good.