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The valves are in the right place so it has to be a misaligned valve. I checked all of the tubing and it's clear of debris so it has to be a misalignment. Since I can't see the inside, I have to guess if it's in the right place. I wish there was a better way.
In the meantime I'm going to take your advice and send in the brush. I just happen to have one sitting in my real trumpet's case.
It would be nice if I could take the metal valves from my real trumpet and drop them in to see if that solved the leaking problem but I'm guessing that's not even close to an option.