Looking for audio repair recommendation


Greetings from Palm Beach Gardens, Florida:

I am looking for an audio repair for a 2016 Yamaha A-S1000. A channel has dropped out. This unit was repaired once before while under warranty only 7-months after purchase by United Radio Service in East Syracuse, New York. The repair seemed fine but now the same problem has developed. I typically listen at lower volume levels as I live in a townhome. I am hoping to avoid shipping the unit as it weighs approximately 55-pounds and it's difficult for me to even it re-pack. Thanks for any assistance in advance and have a great week.

Kind regards,

John
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Many thanks for your suggestions. When I return home, I will definitely try your recommendations.

Kind regards,

John
This unit was repaired once before while under warranty only 7-months after purchase by United Radio Service in East Syracuse, New York. The repair seemed fine but now the same problem has developed.
I suggest you contact United Radio Service to find out what is the culprit.
Yes, previously a circuit board was replaced. However, I was hoping to locate a quality repair shop locally to avoid having to pack and ship a large and heavy piece of stereo equipment from Florida to New York and back. 

I appreciate your response all the same!

Kind regards,

John