The Mark Levinson web site lists these ML repair centers. See link below:
http://www.marklevinson.com/Info/Story/89
One of center is located in Los Angeles. SEE:
George Meyer A/V
12418 Santa Monica Boulevard
Los Angeles, CA 90025
(310) 820-1113
georgemeyer00@aol.com
http://www.georgemeyer-av.com
Based on others posts on Audiogon, I would be afraid to take my ML unit to a non authorized store.
On the other hand, Nick Gowan at True sound in Campbell is excellent. You might call him and ask for his opinion.
Please let us know what you decide and how it works.