If you feel confident in doing so and want to, you can replace the PSU fan with a regular 140mm x 25mm case fan..It's easy enough to do but will void the warranty..Be aware there's potentially hazardous voltage retained in the capacitors, so don't touch any exposed circuits..Wear gloves and/or use insulated needle nose pliers to disconnect/reconnect the connector or otherwise disassembling the unit.
 
The fan in an EVGA 750 BQ  appears to be a Globe Fan RL4Z T1352512HH, 140mm, 12V, 0.45A, 1200rpm, 129.76 CFM, 38.8 dB, Teflon Nano Bearing fan and plugs into it's own little circuit board with a 2-wire (+/-) mini-connector..You'd need to cut the connectors from the fans and use the mini-connector wires only on the case fan's +/- (red/black) wires..Twist or solder the wires together and tape them up..Note the fan's rotation and airflow direction which is normally always shown by arrows molded into the plastic fan housing..Air blows into the unit.
 
Ideally, one would want to replace the fan with that of equivalent or near-equivalent specs, but something like this fan might be the ticket if airflow noise is the issue..Otherwise, you can find them with equivalent or near-equivalent airflow/specs that cost less than RMA shipping and hardly any downtime to replace (about an hour).

I've replaced fans in a handful of units either because they went bad or were too loud for my liking..The original fan in my current Seasonic unit drove me bonkers because it was so loud under load, so I put a slower case fan in it that I had laying around with less of a CFM (airflow) rating and it's been working perfectly fine for a couple years now and is much less noisey and I'm much more happy..I figured if the fan wasn't good enough it would hopefully trip the Over Temperature Protection before something in it overheated and went bad.

Food for thought.
 
Disassembling/repairing a power supply is always at your own risk.