Error code F61 comes on and unit turns off.

The Panasonic SA HT67 drives the speakers in my little home theatre setup. A couple of weeks ago we began hearing a loud pop and the unit would shut off. We would turn it back on, apparently with no problems. This happened a half dozen times. Two days ago the unit suddenly shut off. When we try to turn it back on we get an F61 error code before shutdown. This happens repeatedly, even after disconnecting all speaker wires, etc. Twice after I removed and put back the rca speaker cables it came back on, once for a day, the other for an hour or so. Now we get the same code no matter what I do. Any ideas for fixing it besides a big hammer? Thanks!

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