Help! Shower leaking

I had a hunch to look under my bath/shower unit in the jayco today (waiting on the missus to finish her make up) and noticed water under the shower... I did have to re seal around the tub a few months ago and thought the problem was resolved. It appears the leaks are coming around the top half of the unit. There are little anchors going through The walls. And around the top. When I get home I plan on pulling the unit and accessing the damage. My question is has anyone else had this problem? And if so what are the solutions. Thanks