My 2x 980TI Hybrid "recently" developed a buzzing that's coming from the top mounted radiators. I stopped all fans and this noise continued. It appears that the sound was previously masked by the rather loud stock radiator fans compared to my new Corsair SP120 Quiet Edition fans. It's made my quiet build not so quiet and is pretty frustrating for cards that I spent $1500 on. 
 
www.youtube.com/watch?v=nyIIvRDsuqQ&feature=youtu.be 
 
Attached is also a photo of my case showing the top mounted radiators. 
Is there anyway to fix this without having to go through a full RMA process?
 
Thanks much, 
 

Also, if I cannot replace the pump/radiator easily, is there a way to replace the stock radiator fans? At least the dB level seemed to cover up the pump buzzing.