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So you checked the LP pressure with a manometer?
And are you sure about that model number?
I suspect that you meant it was an Atwood model as Dometic doesn't have one with that model number. Based on what you related in your question that would show that the flame sense portion of the board is bad and you would need to replace that. I am attaching a copy of the Atwood Trouble Shooting manual for you. Print it out so you have it. Please get back to me if you need more input on this or help with getting the parts at a decent price. http://bryantrv.com/docs2/docs/atwoodreefer.pdf
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?