View 3 of YAMAHA P71 88-Key Weighted Action Digital Piano with Sustain Pedal and Power Supply PARTS ONLY first 5 high note keys are not working properly, it won't play or play full volume all the time

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View 1 of YAMAHA P71 88-Key Weighted Action Digital Piano with Sustain Pedal and Power Supply PARTS ONLY first 5 high note keys are not working properly, it won't play or play full volume all the timeView 2 of YAMAHA P71 88-Key Weighted Action Digital Piano with Sustain Pedal and Power Supply PARTS ONLY first 5 high note keys are not working properly, it won't play or play full volume all the timeView 3 of YAMAHA P71 88-Key Weighted Action Digital Piano with Sustain Pedal and Power Supply PARTS ONLY first 5 high note keys are not working properly, it won't play or play full volume all the timeView 4 of YAMAHA P71 88-Key Weighted Action Digital Piano with Sustain Pedal and Power Supply PARTS ONLY first 5 high note keys are not working properly, it won't play or play full volume all the timeView 5 of YAMAHA P71 88-Key Weighted Action Digital Piano with Sustain Pedal and Power Supply PARTS ONLY first 5 high note keys are not working properly, it won't play or play full volume all the time