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Valterra is a great brand which means that the manufacturer may have gone with a cheaper alternative and therefore not as well operating. Whatever the case, you'll want to be connected to a sewer dump and find a way to dump the contents before messing with any valves.
Your problem might even be the valves binding and therefore being difficult to open or close. You'll need to remove any covers under the rig to expose the tank valve assemblies. I have had to do this and don't be surprised if you have to carefully cut any underside coverings to remove them to expose the tank assemblies. Don't do too much cutting since you'll want to put everything back after you are done.
I hope you get this figured out ASAP. Being able to empty the contents is critical for trailer ownership. Besides the obvious removal of the contents being important, you don't want the extra weight of towing the contents from place to place.
Keep us posted. Reading about how others solve their problems is very educational. It just might help one of using our rigs in the future.
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