Mine is making the noise and I have only had it for 3 weeks... I am currently waiting to hear from service.  We had been corresponding last friday but over the weekend it got worse and now its sitting back in it's box.  I haven't heard from EVGA yet but I am sure they have a backlog on Mondays. 
I had a backup 3070 so I have that in another rig and stole the ftw3 3070ti for my rig.
I didn't realize  needed a # for the RMA, I had talked to them for 3 days and would've asked for one :/
Sadly I have heard this noise on a few videos since it happened to me and if it happens again I won't be trying for a third time. I will just deal with the heat and maybe try something else. 
I am fairly sure mine is the pump and not the fan though, I removed the AIO, turned it horizontal (Was vertical mount) trying to work out any bubbles (Not bubbles) and then took out the radiator to try the same.
I have a stethoscope and used it to be sure it wasn't the fan, it is not, sadly.