Hi Everyone - First post here. I'm trying to help out a neighbor whose husband just passed away, and I'm new to the MTH DCS, but not new to electronics. The rev L TIU is blowing fuses on fixed output 1 and 2 immediately on power-up, with nothing connected to the output terminals at all. There's a power brick connected to fixed input 1 and 2, and also to the Aux power in. Can you suggest what might be wrong here?