having read the responses, I'm reminded of an issue I've found once or twice that caused similar issues and it was the last place that I looked and nearly missed each time.
I believe this horn has the plastic/metal valve guide on top of the valve and held into place by the stem that goes up to the valve button. What happened on these other, similar, instruments was that the valve stem had become loosened and the valve guide rotated to the neighboring hole before it was screwed back into place. It sets the valve approximately 20 degrees out of proper alignment and, while allowing air to pass through somewhat normally, creates a stuffiness in sound as well as intonation issues.
Pull the valve and look at it carefully. The stamped number will likely be missing or at least partially obscured. Loosen the stem and try rotating the valve guide into the only other hole it will drop into at approximately these degrees and then tighten it back. Put it back into the horn and try playing. If I have gotten lucky from afar, the horn will blow more freely through the compensating valve and be capable of proper tuning.
I'm 95% certain that this will be the solution OR that you'll find undo wear on the guide that is keeping it from staying locked into the guide slot and that it is rotating slightly during normal use. If that's the case, oreder a new valve guide and replace.
Hope this helps.
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