Re coat the whole roof with Gaco Roof. I did 2 rubber roofs 2 years ago one a 1993 other 1997. They have never leaked again.
Gaco cost $250 for 5 gallons and your roof will take most of it. 2 coats and will never leak again. Dicor simply does not last more than 3 years. It starts to crack and leaks.
Yes it has petroleum distillates in it but caused no problems on my rubber roofs. Best stuff I have ever used in 30 years. Good for all types of roofing used mostly in commercial flat roofs.
Pogoil.