Repair Roland kr4500 sticky key and metalic noise

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Hi,

My 94 yr old neighbor has this piano with 2 problems

1 the middle E key not spring back. How6if pressing it successively, it springs back.

2 whenever i turn the piano on, it gives a high pitch sound....like distorted electric guitar....when I press the keys, they all have a high pitch resonance. I have yo turn off then on several times , then the noise subside. The keys play normally with no distortion.

What could be done?

I have got a service schematic manual. I have taken out the bad key, it doesn't look dirty. I could see the spring(22175178

Key Spring) but no idea if it is the culprit or not.

Would appreciate your reply

Thanks in advance
 

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