I have the same problem with my 99 628 islander no pressure for the galley sink and sounds like the pump wants to run when I turn on the galley sink. are there two pumps? One for each.
The shower and head sink all work well and the pump runes.
Thinking about installing the A/C unit myself, has anyone out there installed one? it comes with instructions but just wandering if there is anything hidden I should know about