Norcold Power Circuit Board 639593/ 638189/ 50861*fits the N7/ NA7/ N8/ NA8/ N10/ NA10 models IN STOCK READY TO SHIP WITHIN THE U.S. Today! 639593 is the Norcold part number. The number 638189 appears as the p/n stamped onto the board cover itself. This is the rear power board/ circuit board th... See More