Since you are an original owner, and your name is probably still on file with the Empeg guys, you could probably
contact support and they might be able to help you.
Keep in mind that they no longer sell the sleds and wiring harnesses. So those are a rare item. Even when they did sell them, they were pretty expensive.
If you decide that you want to repair the wires yourself, please refer to
this pinout list to make sure you've got the wires correct. You might not need to repair many of the wires in that list, you might only need to repair a few of them to get it working again. Depends on what connections you're using for your particular installation.