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AP-450 sustain pedal partially loses effect mid-song

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I apologize if this has been posted before, but I did a search and no results similar to my problem have been found.

I'm having a problem with the sustain pedal on my Celviano AP-450 (purchased in 2012) where if I play something that requires repeated pedal presses, the notes fade away more quickly after a few measures, despite the pedal being fully pressed. For example, when I start playing Pathetique (2nd movement), the sustain pedal works as it should. But when I reach somewhere around measure 8, the sustain pedal begins to lose effect (but not completely), with notes sustaining only for about 2 seconds before completely fading away even though the pedal is fully pressed. I've checked the pedal assembly and the wires, and everything seems normal. I'm at a loss here, and it really ruins the music :( .


Any suggestions would be greatly appreciated. Thank you.




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