I would look at owners manual for a plumbing diagram. That should help. If you don’t have it try logging into the Thor Owners website. Just go to main Thor page and click owner.
On my 30.2 in the water bay behind outdoor shower if I remove the panel there is a manifold with all cold water connections. If the supply to this was hot that would cause all your issues. If you don’t have a similar manifold or it’s cold there then you need to source where the supply lines connect. I have pex run under the sinks and normal supply lines under sink. If you have same set up then unscrewing the supply lines is an easy fix under sinks. Is your water pump and sewer compartment inside a storage bay?
My water heater is under kitchen sink. Check those areas.