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I believe you assumption about the clamps is correct. The rubber isolator on the clamp makes a brown stain on the white wires over time and the wires near the center of the bundle stay clean while the surrounding ones get brown marks on them. First time I saw it I thought the same thing, I...

With just 590 hours I'm surprised your oil pressure is that low. Normally I would expect to see 28 psi or higher. Did you happen to verify pressure with a good mechanical gage? If you end up tearing the motor down to inspect it, take a look at the oil pressure relief valve. You may be loosing...