Need a rough estimate of art print restoration

its called
foxing" and it cn vary based upon

1severity of the mold growth
2whether any damage has occured to the paper

the cost can vary between , 75 and 400 dollars, so the print should be something worth saving.

The conservator should stabilize the paper and either reframe with a matting, "standoff" and glass .I am assuming youll keep your frame. Those are extra costs.

since most conservation techniques involve, UV shining on paper wetted by DISTILLED water, chloramines, or a mix of peroxide and ammonia, or (worst) hypochlorite, many museum guys say, if the foxing isnt damaging, just let ot be. Just arrange to have the glass NOT touch the print , keep it in a dry environment, and in low light.
If the foxing is just a cosmetics problem , dont mess with it because most all the above chemicals have consequences( even the UV nethod)

Sometimes I am amazed at the breadth of your knowledge.

I have 2 friends who are conservators over at the Winterthur Museum. I ask them questions all the time and they are great teachers.