Sadly, the manuals for the trailers are not specific enough to identify the location of your water pump. Also, I do not see the water pump location described in our Threads.
If you still have water in your water tank, could you just turn-on the pump and hunt it down by sound?
Welcome to the forum.
2019 Minnie Winnie 22M on an E-450 frame
Most Micro Minnie’s have the water pump under the galley sink. Look at the bottom of the storage area under the sink. There’s likely a luan panel as the base of the cabinet which has four screws in it. Remove the screws, and the panel, and voila
Jim. Former, 2021b Micro Minnie 2108DS
Medically grounded, but still lurking the Micro Minnie Discussions