Access to kitchen sink leak

Thank you!!

Many of those cupboards have a false floor in them. It will require removing everything from the cupboard and checking for screws or fasteners that hold the floor in place. Most of ours are held in place by a couple of screws and then the weight of the contents does the rest. Most are two piece to make them easier to remove and replace. Hope this may help. Happy Trails Bert

Thank you for the response!!
We do have a false floor. How do we access between it?

welcome to rv repairs ,wipe your hand around the drain pipe as it goes to the floor ,use a tissue it,ll find leaks if its thru the floor just gotta hunt you might have a false floor that the pipes run in. some times these leaks can cause real bad headaches.