The door opens by removing a screw (or two) with a square headed driver. It is not a big deal to me. I keep the driver in the trailer "tool bag". Have to get in there to change the filter and winterize/dewinterize.
Now to your leak itself. Most likely it is not the pump, but a hose connection. Changing the pump might "cure" the problem because the leaking fitting might get removed/replaced/retightened.
We have a 2019 2608bs and love it. After 2 seasons, we developed a leak in the water pump area. It evidenced itself by water on the floor outside the water pump compartment. When we were "hooked up" to city water, there was no leak.--only when operating on the pump. So, I assumed that it was the pump.
Turns out the discharge hose from the pump was leaking at fittings at both ends, giving the appearance that the pump was the problem. The hose was just a little bit too short. (2) seasons of jostling on the road had loosened the fittings so that they leaked when under pressure. On my unit it was a high quality hose with a barb fitting and hose clamp.
To find the leak(s), I taped paper towels to the hoses next to the fittings and then checked at regular intervals. Almost stopped after I found the first leak, but kept looking and found a total of (2) leaks--both ends of the same hose. We had an extended warranty and it was covered. Technician replaced the hose and fittings.
I have placed a battery operated water sensor on the floor of the water pump compartment to give me an early warning if another leak develops.
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