The charge for the diagnosis seems excessive to me, too.
However, I don't believe faulty harnesses can be fixed or rebuilt.
The wiring insulation failure happens all over the harness. I don't see how anyone can properly remove / repair the deteriorating insulation.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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