Send it to Audio Classics in Vestal, NY. They have an excellent repair department.
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Pyramid Audio out of Austin Texas. They are 1 of top Madrigal/Levinson/
Proceed repair facilities in the country. I had same problem with my amp 5 that I purchased in 1999. It is most likely an issue with the center channel over heating, causing a short that is triggering the protection system. Most likely not worth fixing. Mine had the issue in 2011. I decided to junk it and go the receiver route for Home Theater.