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The high E on the G-Row of my Marcus G/D stopped functioning yesterday in the middle of a session (R4^ in my terms). I was able to partially get round this by using the E on the D-row (dR2^), but my question is - is this a 'sticking valve'? - I have shaken the instrument (gently and carefully!) and there is nothing rattling around inside. - I can hear air passing through the valve when I (gently and slowly!) draw the bellows out with R4 depressed - there is simply no sound. I do seem to need more pressure to do this pull on R4, than I do doing the same on dR2, so summat's wrong... I am prepared to have the end off and have a look, but I'm still a nervous beginner as far as maintenance like this is concerned, so I'd like to canvass opinion here. What's my best approach to this? Any advice welcome. Fortunately, I have a second G/D, so I'm not about to be silenced by this slight mishap (my fellow musicians might not regard this as fortunate... ) . Thank you. Roger