having the same thing on the same dungeon (eagle's tower) do u remember which flag was it that solved the locked red door for you?
It was a few days ago so I don't remember exactly what I did, but I tried all variations of 0 and 1 on these lines of code:
s d7_enter_I 1
s d7_instrument 1
Try alternating the ones and zeros. There was one combination that opened the door but the instrument was gone. You would assume it would be:
s d7_enter_I 1
s d7_instrument 0
Try that and if it doesn't work, then reset and try again. I think it didn't work for me at first but then worked. Good Luck!