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There are apparently two for the FM stereo to mono fade-both are linked somewhere here.

(There is also a TSB for the FM antenna amplifier- not sure that is posted)

I'd take the older one to the dealer- it doesn't require them to verify the failure prior to ordering the new radio- of course if yours is actually doing the fade pretty repeateably, no problems-

Hey- post the links in a reply- it might help someone in the future.
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