It looks like the "goodwill" policy is not interpreted in the same fashion everywhere.
One of my friend with a 1994 E320 (well over 100,000mi)had his wiring harness replaced last fall. All he had to pay was for 4 hours of labor as the dealer (or Mercedes) took the beating for the parts.
The car was not even originally bought at this dealer.
Anyone who has been around Mercedes afor a few years is fully aware of this problem.
JackD