I have almost completed a

Question

I have almost completed a diy modification of a Marantz CD67 Mkll OSE cd player. When I connect earphones the machine plays beautifully. However, when connecting the analogue audio output, sound is only played on one (left)channel. Repeated tests have indicated that both opamps are working. Both input and output legs of opamps voltages are according to service manual spec but when testing the final connection between opamp section output and audio output GND, unusually high voltages are emitted, ( 7 - 9V) where voltage readings should be 0.0V.Any CD player experts able to diagnose and direct me to the section of the board requiring attention and or repair.