Hey, all. I don't know much about appliance repair, so I'm hoping you can help. We've had a Frigidaire refrigerator for about six months, and it recently starting making a knocking sound. It still cools, but I'm wondering if this is cause for concern.

I took a video and uploaded it here:

The fridge is still under warranty, so I'm wondering if its worth having someone come out and look. Thanks for your help!