Based on my experience with a 2008 21QB and 2016 23QB FR makes no provision for service / removal or replacement of the water pump with normal tools. It appears they install the pump to the underfloor then build more of the RV partitions and floor over and around the pump.
After all since they do not stand behind the products they build, for much longer than the time it takes to drive off the dealer lot, what do they care about being able to service a pump? They know it is the owners that have to make the effort and pay $100 an hour for someone to try and figure out how.
Before you ask. Yes I bought a 2nd one knowing full well the problems new and old I could expect from FR. I have the facilities, tools and mechanical automotive experience to fix the mistakes they sell.
I write a blog on RV tire application and safety. RVTireSafety.com
Also give seminars on tires at RV events across the US. 40 years experience as tire design & quality engineer for major tire mfg. Freelander 23QB on Chevy chassis is my RV