2021 MHC 281CK - leak at Center kitchen

[FastLane5]

Need some help with schematics and leak. Trying to diagnose a leak we found located at the bottom of our center kitchen extension. Does anyone know what be located in the cabinet below the kitchen counter on the floor if there’s a water line running through the base of the cabinet ? We see no leaks from ceiling, no leaks from outside or floor, under camper- emptied all tanks and water heater- stumped!!