JL Audio HD750/1 flashing green light

Of course. The negative rectifier. The one on the right. The rectifier on the left is the positive rectifier.

See attached.
 

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It's part of a photo someone sent me when they were asking for help with their amp. This is all I have other than the meter readings you posted to make this suggestion. You don't seem confident and I cannot guarantee that this is correct. You can wait until someone can tell you definitively what goes there. Have you tried asking JL? They may not provide a diagram but may tell you what goes there.