When same thing happened to us and you have it under control, but thought I'd add my experiance and what I did. (Not saying what I did is right or wrong)
I used foam insulation as replacement as foam doesn't trap water as much.
With us... a grandkid got up in middle of night and didn't want to wake anybody so she gently released the foot valve, and aparently so gentle that the valve didn't shut off supply water all the way. Atleast that is what Thetford's customer service best guess was. Other guesses was what the valve rides on had a rough spot or a wear groove in the plastic and valve didn't "seat" all the way. Now before anybody uses the toilet we give a "potty" lesson on how to use the toilet and don't be gentle with foot valve. That was also when we went totally self contained mode in water department only. No more of an unlimited water supply coming in if something breaks, pressure valve or not.
Then filed insurance claim, but nothing could be done until there was actual damage and how much to fix. But a file was started as a "open claim" and to call back in when actual $$$ amount of claim could be established.
Then dried out with dehumidifer and I picked up moiture meter from big box store. Kept dehumidifer going till until humidity gauge inside TT matched just about what was outside. Took several weeks just to be sure. Moisture meter that pokes into wood with little prongs pretty useless IMO. Moisture gauge helpful.
Then put in another water pump switch in bathroom and little led light visible from outside. As a reminder when we leave TT make sure led is
not on. As in no elec going to water pump. And I put one of these under the sink, under water pump and under bath.
https://www.homedepot.ca/en/home/p.battery-operated-water-alarm.1000800787.html (link doesn't want to work... "watchdog water alarm")
Doesn't gravel feel great laying in it? I changed a starter in a campground once. Not good so I picked up a cheap foam yoga mat that rolls up nicely. Helps a lot.
Couple years later out of the blue, the insurance company calls and tells me they are closing the "open" claim. I forgot all about it and have no damage to TT that I can see.
2003 Majestic 23P... Northwest travel machine
2013 Arctic Fox 25W... Wife "doll house" for longer snowbird trips
2001 "The Mighty Dodge"... tow vehicle for "doll house"