Your RV is relatively new, chances are the black tank valve is not "worn out" so the leak is probably coming from either the valve not closing completely or some toilet paper or other foreign matter stuck in the groove where the slide blade is supposed to seat.
There are a number of people who have the same problem and have discussed it on the forum, you might find their experiences by doing a search for black tank valve or valve leak or something similar.
Essentially, it will happen to all of us if we don't dump the black tank properly and if we don't lube the slide valve mechanism to keep it functional.
As a general rule, NEVER push the tank valve closed while emptying. Doing so will push anything that may be going through the valve at the time into the groove. That will prevent the valve from closing. As for lubrication, many holding tank additives have a lubricant in them, but some don't. You can use a small amount of olive oil (or other vegetable based oil) occasionally, or you can buy dump valve lubricant. Don't use petroleum based lubricants as they can soften and deform the rubber seals.
As a temporary (or even a permanent) solution, CW and other RV parts stores sell a twist on sewer valve for about $20 that you can attach to your sewer outlet. It is essentially a second slide valve and will seal against any leakage from the primary valve.
If your valve is relatively close to the dump outlet, you may be able to access the rubber seals to clean them by reaching inside the outlet. If not, then you would need to remove the coroplast cover, disassemble the valve and clean it. Since you're probably still in warranty, your dealer may do that for you, however, keep in mind that a "dirty valve" is not a warranty problem and he may charge you for cleaning the waste from the seals.
Good luck,
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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