Hi again,
In terms of servicing go to an AD or leave the work up to the good guys here
Scott is right that a tropic (even the domed one) can have minor hair cuts and absorbe water (had it myself on some
). Also the back side and crown as well as glas holder edges can absorbe water as well if the gaskets are destroyed!
In terms of parts you can get almost all of them either by Rolex or an RSC or also from fellow members here
You asked for a bezel + tropic etc.....
Just send me a PM or ask for other ones such as Steve and we will help you to get your 5513 "project" finished
Best
Axel