Not sure when on yours the pump is located, on ours, which is the 24TX, there is a compartment door on the drivers side right behind the compartment that contains all the connections for the black and grey tanks, in which the fresh water tank is located. As you face the tank, right at the lower right corner of the tank, the pump is mounted, easy access. Hopefully the 23TR is not that different than the 24TX.
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