JL Audio 300/4 Repair?

Generally, people who repair JL amps make jumpers like the ones below. Have you made anything like this?
 

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You can't expect to repair an amp without spending money. You'll have to decide what you're willing to risk in the attempt.

Understand that it may not be possible for me to get you through the repair so anything you spend may be lost.

If it has no value for you, sell it on ebay as parts/repair.