Ebay GT45 + 5.9 Magnum + E85 blow thru

Dead in the water. Fitech unit went back for an RMA. ECU broke apparently. Hope to get it back in time for TNT this Friday. The only thing I've done to the car is take off the hotside and repaint and wrap it to try and get under hood temps under control.
Was it a freak accident, or was it a mechanical failure on the unit itself? I've heard Fitech can be hard to reach and deal with on warranty claims.