Pianotech

I am on the coast of SC and humidity is a problem most of the year. Depending how close to the ocean the piano may be getting a good dose of humidity as well as some good ole corrosive ocean air. I have had customers leave windows and doors open all day and night because they like the smell of the air and the breeze.I am surprised the pin block did not get damaged from constant heat from the dehumidifier bar 24 x 7. You did not mention string rust which also be a problem You could try repinning some of the worst hammers but it may be time to price new h/s/f .  After all the piano is up there in age. Also find out what the customer does with windows/doors and HVAC settings 

There's no need to be close to the ocean to develop "cancer". Try getting some TSI 301 and give it a dose, and see what happens. Maybe two shots. 

I had a case where the shanks and flanges had been replaced like in the 50's or so. By now they had developed mild verdigris. Generally easily cleanable. I cleaned it and it was good for a while but some sluggishness persisted. Cleaned again and again over time but sluggishness persisted. Very strange...

Finally I decided to repin. That was how I found the real culprit. Many center pins were scored and/or bent, much plating was gone, creating unusually excessive friction. Repinning with precut SS center pins solved the problem. 

I have no idea how such damage occurred on these factory parts, but it was there. 

Peter Grey Piano Doctor 

I am on the coast of SC and humidity is a problem most of the year. Depending how close to the ocean the piano may be getting a good dose of humidity as well as some good ole corrosive ocean air. I have had customers leave windows and doors open all day and night because they like the smell of the air and the breeze.I am surprised the pin block did not get damaged from constant heat from the dehumidifier bar 24 x 7. You did not mention string rust which also be a problem You could try repinning some of the worst hammers but it may be time to price new h/s/f .  After all the piano is up there in age. Also find out what the customer does with windows/doors and HVAC settings 

There's no need to be close to the ocean to develop "cancer". Try getting some TSI 301 and give it a dose, and see what happens. Maybe two shots. 

I had a case where the shanks and flanges had been replaced like in the 50's or so. By now they had developed mild verdigris. Generally easily cleanable. I cleaned it and it was good for a while but some sluggishness persisted. Cleaned again and again over time but sluggishness persisted. Very strange...

Finally I decided to repin. That was how I found the real culprit. Many center pins were scored and/or bent, much plating was gone, creating unusually excessive friction. Repinning with precut SS center pins solved the problem. 

I have no idea how such damage occurred on these factory parts, but it was there. 

Peter Grey Piano Doctor 

I am on the coast of SC and humidity is a problem most of the year. Depending how close to the ocean the piano may be getting a good dose of humidity as well as some good ole corrosive ocean air. I have had customers leave windows and doors open all day and night because they like the smell of the air and the breeze.I am surprised the pin block did not get damaged from constant heat from the dehumidifier bar 24 x 7. You did not mention string rust which also be a problem You could try repinning some of the worst hammers but it may be time to price new h/s/f .  After all the piano is up there in age. Also find out what the customer does with windows/doors and HVAC settings