Actually, the defective harness issues involved the deterioration of the insulation of the individual wires...you can't tell visually just by looking at the main wire loom without cutting into it and inspecting the wires inside.

That said, most have had the harness change performed. Those that have not eventually experience a myriad of electrical issues, especially after the harness has been disturbed (like during a head gasket project).

You are probably okay if you haven't had issues yet...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car