I recently purchased a Frigidaire FFTR1835VW after using an old Hotpoint for many years. When the new fridge kicks in and starts humming, about a minute into the cycle it will start making this kind of grindy noise? It will get louder as the cycle continues (about 20 minutes) if you skip through the MP3 you'll hear the noise throughout with the regular hum. If you skip to the very end, you'll hear the end of the cycle and the noise becomes very clear.

Link to MP3

I had a repair tech come out and tell me it is a normal sound of the fluid running through the appliance. The noise eminates from around the back top left of the fridge. I just find this hard to wrap my head around because it is so noisy and I can hear it throughout my apartment during each cooling cycle.

Hoping that someone hear could skip through the MP3 to hear the noise throughout and go to the very end of the file to hear it clearly.

Is this normal?