There is a lot of good advice here. May i add my two cents' worth, from many years of experience with both older and newer fridges...
As to 'burping', there used to be a last resort of pulling the fridge and setting it on its top for a day, then reinstalling it and allowing it to sit for another day, before starting it... Often worked...
But the smartest thing I ever saw is what i used to see my Dad do: put a bullseye level in the floor of the fridge, as he was leveling the trailer. He always said, "You don't know if the fridge was installed plumb or not."
To prove him right, we had one trailer where the fridge was installed a half bubble off from the floor.
Hope that helps.
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