I have an AEM EMS. The previous owner hacked up the ECU harness, wires cut, wires spliced, wires cut and resodered.

Has anyone ever had to replace the whole ecu harness? Does the harness go from the ECU to the engine bay with all the plugs? Or does it seperate by the firewall?

Also I have been looking online for a new one and there is no luck. I contacted a dealer via Email and hope he can give me some information. Thanks for your input