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Hi my name is Robert....
Click HERE and see page 7-11 it will show you the drain valve location, it will be Two (2) drain valves on left side of coach mounted on frame and the tank is One (1) valve beneath forward facing dinette seat. Remove panel to access.
Hope this helps some, IF you have more questions or concerns please feel free to contact me, follow ups are included, IF you are satisfied with my efforts please feel free to select a star rating on the page..... Robert
IF that is not the right model (59G) please let me know what model you have I should be able to access some diagrams.