If you don't care about the back-story, skip the first two paragraphs 

 I've had my FKBN87M/NPEK for a few months now and really enjoy it.  However, after the first few days, I noticed a couple of keys had a strange reverberation when I released them.  A "springy echo" is how I would describe it.  The easiest way to reproduce it was to slowly press the key all the way down, wait a second, and then release.  But the sound happened with normal movements while typing too.  For those of you with filco keyboards, is this a normal sound?
I contacted elitekeyboards and they sent me over a new keyboard.  I tested all the keys and to my dismay I found the 'e' was now producing the noise.  I decided to just get used to it and that I was probably being picky (this is my first mechanical keyboard).
Anyway, it's still pretty annoying, and rather than taking a chance on yet another keyboard and possibly having the sound on more than one key, I wanted to know, how difficult is it to swap the switch on the 'e' key with one of the lesser used keys?  Can I do this without voiding my warranty?  Is it possible to just swap some pieces of the switch?  Like the spring?
As you can tell, I don't know much about this, so any advice would be appreciated.  Thanks!