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TIU Blows fuses with no load

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?

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

www.ogaugerr.com
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