How to access water pump??

[Punchy]

Hello,
can someone please advise me on the best way to access my water pump for my 2018 Jayco alante? The pump has given up for some reason . I can see it when I open the water access bay - it is above the filter when I look in to the left. The problem is ,I can barely get one hand up to the bottom of the pump unit so I will not be able to remove it from here (unless I was made of rubber!!) . My neck is already hurting just trying to squeeze in there to have a look.
I was under the impression the access from inside the RV was under the sink but when I took off the panel on the right (when under sink) there was no pump visible here: I feel it is just under the area I accessed under the sink but no obvious entry there.
Am I missing something ?
Can anyone help please?
By the way I am not very technical or a "tool guy" !! I was just going to be brave and go for it this time in order not to lose my unit to the dealer for the rest of the Summer
Thanks,

[KHabie]

I have a 2018 31P. I have replaced my water pump, it is difficult. It is attached to a plywood plate and then to the sidewall of the compartment. I removed the pump by removing the 4 screws holding the plywood plate to the sidewall. I unscrewed the 2 water lines and pulled the pump down. When I replaced the pump. I put 4 machine screws through the plywood plate, through the compartment sidewall. I mounted the new pump to the plywood plate. Pushed 4 screws through the plywood plate and then through the compartment wall. I put nuts, flats and locks on the screws as they protruded through the compartment wall. I then connected the 2 water lines. Note: all the screws are removed with a square drive tool.

[Punchy]

Thanks KHabie.
My issue is I can’t get at the pump from outside. Did you do your job from outside or did you manage to access the pump from inside the RV?
I appreciate your help.
Punchy

[KHabie]

I am not familiar with you exact unit, however I believe the compartment that houses the water control board/valves is the same. My pump is above the large water filter on the left wall of that compartment. I cannot access my pump from inside the coach. It is a tight fit.