I have a 2 - Z4000's with handles supplying power to all 4 channels of my TIU. TIU has an auxiliary power by Z750 brick.. Everything worked great till my grandson forgot to throw a switch from an unpowered siding and derailed my GP-40 (PS3). I now have flashing light on one Z4000 indicating a short. TIU is Rev L. I disconnected feed wires from transformer to TIU and transformer shows no short. Reconnect feed wires to Fixed 2 and disconnect output wires from fixed 2. Short is back. This eliminates track and wiring. Looks like I have a TIU problem. Am I correct and is this repairable or am I buying another TIU?
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