Kubla- Assuming that the pre-amp isn't passing dc to the amp, or RF getting into the amp, and that there aren't speaker cable or interconnect problems, the amp is sick. It is likely a faulty sensor (dc offset or temp) or the amp is overheating due to incorrect bias on one channel or both. Not knowing the circuit topology, repair could be easy or a real pain. $380 does sound high. Try a different repair center for HK. However, it could easily run $250 if it requires more than an hour just to troubleshoot. I hate to say it, but it might be worth checking into the cost of a replacement component just to weigh your options. Good luck.
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