Colour of Duetto 1998'ish brown rain gutter?

Does anyone know the colour of Duetto 1998'ish brown rain gutter?
It is very hard to remove the guttering without damage , and now needs minor repair to the outside gel coat , and extensive repair ,replacing the rotten plywood etc. on the inside of the gutter section.
It is hard to believe that a Duetto roof can leak , Autosleepers must have run out of sealant when they fitted it.