Richard....... I've never run into that, but according to my service manual the testing procedure following on an F10 involves the pressure switch and the module board, both of which involve the removal of the top and/or rear panel of the machine. (pressure switch-right front top; module board-right lower rear)
Unless you have the space and skillset to follow up yourself, now might be a good time to call your service contract person!
Good Luck!
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John and Diane (RIP Lincoln, 21 FEB 22) RVM103 NHSO
Fulltimers since June, 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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