I just noticed that there is mold growing on the bottom of the roof
sheathing in my attic. I'm not sure what is causing the mold to grow there.
I had a new roof put on my house after I bought it, which was less than 9
years ago, and I don't see any evidence of any current leakage from the
roof. I'm assuming the mold growth issue is a new problem that has
gradually developed over the years, since it's likely I would have noticed
it if it was there when I bought the house.

By the way, my bathroom has no fan, so, when I take a shower, the steam
stays within the house (one story ranch, only 1000 square feet). Could
the mold problem be caused by moisture from the shower making its' way up
into the attic? If I were to have a fan installed that vents the moisture
outside of the house, do you think there's a chance that this solve the
problem (or at least prevent it from getting worse)?

The mold is mainly growing on the sheathing that is on the side of the attic
in which the roof has less exposure to the sun. My attic has two vents
toward the top of the roof, and two vents on the sides of the attic. I'm
skeptical that adding more vents would be of any real benefit.

Anyway, I'm worried, that due to the mold, I may be given a hard time when I
sell my house.
Other than having a fan direct the moisture from the shower outside the
house, and to use an air purifier in the living area, which of the following
should I do before selling the house:

1) do nothing, since the mold is in the attic, but fully disclose the
problem, and put the house on the market "as is" at a reasonable price.

2) Hire a handyman to scrub off the mold with a fungicide and, if
successful, don't mention the mold when selling the house.

3) Hire a handyman to scrub off the mold with a fungicide and fully disclose
that there was mold in the attic when selling the house.

4) spend thousands of dollars having a "mold specialist" inspect, test,
correct the problem, re-test, and then put the house on the market
disclosing that the problem was corrected by a mold specialist. (If I'm
mistaken, and mold specialists don't actually charge thousands to correct
the problem, then let me know)

Any suggestions would be appreciated.

Thanks.

Jeff