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Hi my name is Robert....
Yes you can check the gas valve with a volt meter, you would ohm across the coils to see if it is good, click HERE for a service manual and it will show you how. It will also show the location of the ignition board which is behind a plate, the last few pages show a break down of the furnace. Normally when the furnace starts sparking you should also hear a click from the solenoid when it opens. As far as the circuit board which could be the issue most RV shops have a special board tester and can tell if the board is bad or not... Hope this helps, IF you have more questions or concerns please feel free to contact me. IF you are satisfied with my efforts please feel free to select a rating, it is the only way I get credit.... Robert