Welcome Aboard!
My suspicion is a FW line leak, second would be a bad shower drain connection.
Are you connected to city water while this is happening? I suspect so. You may have a leaky water pipe fitting. Have you used the FW tank at all? Put a few gallons of water in the tank. Disconnect the city water connection. Turn on the pump, run a little through the lines. Then make sure all the faucets are turned OFF, but leave the pump turned ON. If the pump cycles when there is no demand for water, there is a water leak in the plumbing. The bigger the leak, the pump will cycle on more frequently. This will let you know if it is your FW system or somewhere else.
If could be a leak in a waste line, such as a shower or bathroom faucet. Hopefully not the toilet line. Waste lines often are a bit more difficult to locate, as it is more intermittent.
Pending on your 5ver there are a number of removable access panels in your cargo hold to access the mechanicals. It would be well worth snooping around.
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