其實支笛系唔會吹唔響的,走音的問題可能因為keypad的老化,當你按下去時有空隙所以有走音的問題,加上d screw亦有機會鬆左.如去Tomlee maintenance,佢地成支flute清潔之外,仲會check曬有問題的地方,for example, replace new keypad or not, they will quote you a price after checked by the technician(not in Tomlee's outlet, but at the service dept).
This may take about 1 month's time.