cabinetry

My dinette cabinet console is sagging. I noticed a small sag when I purchased the boat but now I notice a considerable drop in the middle which is causing major cabinet alignment issues. I am wondering if anyone else has experienced this issue and if so, how to repair it.

New to us 90 350 Sundancer. She wants to change out the drawer pulls. Anybody know the center-to-center distance on the screws? Would go measure but the boat is on Lake Ouachita n we are in S. Louisiana waiting on Laura to come ashore.