Flat Roof Leak

I have a Falt Roof that was resurfaced 10 years ago w/ a “rubber” membrane. It is in gtreat cond. I have a door our to this roof that has aluminum flashing that is chalked and continually leaks thru onto my porch below. I am about to recoat the roof, but wonder if anyone can recommend something ( some material or “patch” I can cover the flashing with, then I will coat with roofing material that may hold up for longer than a year to 2.