It could be a bad relay
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Thanks for the responses - I'm trying to find a schematic of where the fuses are as I am a bit of a novice on popping open the hood on these devices.
One other note- zone 2 works just fine. I've heard that sometimes these receivers get 'stuck' thinking headphones are plugged in when they are not, but I can't see that there is any indicator on the display saying the receiver thinks headphones are plugged in (there may not be any indicator, period). I have tried compressed air, and need to track down a 1/4 inch adaptor to see if it's anything physical that could get jarred by plugging in/out.
The "clicks" you hear are relays that "snap" to connect electrical power to different parts of the receiver. It is possible that it is a bad relay, but it is not likely. I think the more common root cause of this problem are electrolytic caps drying out for the "relay input". It won't have enough current to snap on the relay. The power for these relays are typically from an "always on" switching power supply, but it could be another part of power supply.