I was refering to this comment...
I haven't seen any evidence on this forum of anyone treating gas systems flippantly.
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This might sound horrendous, but a proven method to correct is to remove the fridge - turn it up side down. Give it a few gentle shakes then rest it for a minute or so. Turn back to its up right position - shake again then rest. Repeat the above then re install the fridge.
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I felt it was pertinent to reference the domestic points of the regulations to show how seriously gas safety needs to be taken, and to show how the GSIAUR are not the only regulatory requirements then need to be fulfilled even on private touring caravans and motorhomes by their owners.
Regarding the OP's problem, He clearly has not resolved it, and it needs more investigation and if it needs disassembly it should be referred to professionals.