Ok so I'm looking for some advice from someone that's familiar with quantum quiet drives. Car shut down between floors with 639 six pack negative flt. U + section of 6 pack was to blame. Ordered and replaced with new, ran on MARM inspect with no problems and then decided to make a few floor to floor runs. Everything seemed to be working normally until I made a run from 2 to 8 and then it shutdown between 7 and 8 with same 639 flt. Checked new IGBT and same section defective once again. I should also mention that the F1 fuse blew on DSP board too. Any insight would be greatly appreciated. Thanks in advance.