F500 Oslo v3 side loading door whistling

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Could be a leak. Check your gasket and seal with dollar bill test.
 
Could be a leak. Check your gasket and seal with dollar bill test.
Thanks for your response! I tested the gaskets on both doors and they seem fine. The more I observe the stove, I’ve noticed it seems to be coming from the back of the stove and only happens at start up until it warms up a bit. It goes away when opening either the main or side loading doors. It doesn’t happen when the surface/catalyst temp comes up.