It seems to me that if a G# key leak caused by poor regulation were involved, it would have a greater effect on bell notes. I agree with Gordon that the placement of the leak has a great deal to do with the notes affected. I would suggest checking that the key opening of the lower stack keys is not too closed. I would also check that the F and E keys are closing the (stack) F# completely and also check the fork F# for leaks.
John
John
