My refrigerator (Bosch B22CT80SNS01) sits in an alcove and has begun intermittently making a noise from what seems to be the inside. At first I thought it was the water filter/lines having air, but I’ve switched the filter and cycled water for a few minutes. Running the water doesn’t stop the noise when it’s happening either, nor does it sputter.
It sounds like it’s behind an inside panel at the top, maybe a fan or something? See video below.