Finally fixed mine. Besides scraping off the all of the silicon, I spent most of my time drilling out rusted screws... what a pain. Also, I was surprised to find what looked like a botched attempt from someone else (may be previous owner) to fix the problem. They had placed a metal strap under the WH to support it, screwed into both sides of the compartment. It was stretched and provided no support.
I simply added two 2x4s along with the existing sheet of plywood (I didn't want to cover up my access port). I ended up having to add a few shims in order to get the WH high to the right height (another pain).
I was planning to disconnect the hoses from the WH but then realized I had no idea how to remove them without causing damage. Are the hose clamps removable?