Jitjai

Suddenly during practice E5 just dropped from the normal level and never return. Some censors might also be disconnected, causing sound-related problem, too. Wonder if anyone has experienced similar problems, and can perhaps advise IMG_0575.MOV on DIY fixing. - Is new part or replacement required? Any particular name or reference of product no? - If not, what is the potential component failure? Any work-around or resolution? Thank you so much.