Hartke HA4000 cuts out?

My Hartke HA4000 amp cuts out any ideas please. I've changed the fan (twice) but it still cuts out. Hadit running with an audio signal very loud for about 4/5 hours 'til it was very hot & it was ok, switched it on the next day - 2 minutes & it cut out. any help appreciated

Rayzer

November 2010

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