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If you restored the 12 vDC again, then it should cool on both modes as long as you have LP and AC coming in to the board. If the cooling isn't good on LP mode the most probable cause is that the LP working pressure is too low at the tank regulator. That should be checked and adjusted as needed at least once a year.
I am adding a link to the Norcold Service Manual for you that explains some of what I told you. Print this out so you have it. You can have most any shop check that pressure for you. It takes a manometer. http://bryantrv.com/docs2/docs/ncold900.pdf
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