You absolutely do NOT want to leave it alone. If you do, the damage from the water will continue to spread. The damage is most likely from dry rot, which is a living organism with the ability to channel the water with it as it grows into new, healthy wood. It consumes the cellulose, i think its the cellulose, which weakens the structure if the wood and will eventually turn it to little pieces that look like burned out cinders. As long as it has enough moisture, it will continue to grow and cause further damage. Cutting off its water source will cause it to go dormant and/or generate a flowering body to produce countless spores.
First off, you need to stop the leak. Next you need to assess the damage that its caused, so far. You can do this by poking the wood with a sharp object like a screwdriver or such. If it penetrates easily, the wood there is damaged. Find where it stops, and assess whether or not you can fix it yourself, or whether you need a shop. If you do it yourself, you need to remove all the affected wood and then a bit further into unaffected wood just to be sure. Once the rotted wood is removed, you need to treat the area with a mold killer. There's several kinds. Bleach or vinegar work, as do the many commercially available mold killers. i opted to make my own from antifreeze, boric acid, and borax. Treat the area and let it dry, thoroughly. Then simply replace what you removed. Easier said than done as everything in a trailer seems to take 5 times longer than you think.
Definitely do NOT leave the rotten area there. It needs to be adressed ASAP!
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