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Pioneer SX1050 Service Recommendation - Massachusetts

I picked up a Pioneer SX1050 receiver 2 weeks ago. I would like to get it in for a general cleaning and servicing since it is 40 years old. It is physically in mint condition, but does play differently out of the two channels (right side is a little less volume than the left side.

I am located in the greater Boston area and was looking for a recommendation for who in the area is reputable for servicing this vintage receiver. Any recommendation would be appreciated. .