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Classe CA 201

I recently purchased this pre-owned amp. It began making a poping noise out of one channel. the channel now intermittently works and it seems to run quite hot.
Have disconnected and re-connected all components, still pops. Have disconnected interconnects to pre-amp, left the speakers cables attached and it still pops. Have tried alternate speakers, it still pops.

Classe wants $300 just to look at it.

Please help!

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