When we bought out house, the inspector noticed mold in the attic on the underside of the roof sheathing. Luckily it wasn't one of the nastier strains, but we wound up having the roof replaced (needed new shingles anyway) as part of a non remediation "remediation".
The HI thought it was due to the soffit vents being covered by blown in insulation and the venting of the bathroom fan directly into the attic space.
