What needs attention
A stain that returns after a window alteration. A mark that follows later rain deserves a timeline that includes earlier window work, without assuming the alteration caused it. What evidence distinguishes current ingress from residual staining before another trade is asked to repair the opening?

A later rain event does not prove faulty window work
Keep the alteration date, first stain observation and later rain-related changes on one timeline. An older visible stain and current moisture are different findings. The window history can guide the inquiry without establishing that the alteration caused the present condition or that another water path has been excluded.
Use the finding to choose the next trade
Before asking someone to repair the opening again, clarify whether the assessed evidence supports active entry there. If the cause remains suspected, the report should identify what further authorized access or observation is needed. Cosmetic restoration and correction of a confirmed water source should remain separate work decisions.
Access for the affected space
If the affected space includes original trim or a restored finish, bring existing alteration records and identify the elements you want protected. Preservation choices need the actual material assessment. For an investigation, provide existing source-repair records and explain which concealed area can be accessed with permission.
Related cleanup information
Old Naples service area; Moisture source identification; Compare the cleanup scope.
Sources and further reading
Your next step
Talk through your mold concern.
Have the address, affected room and any known water history ready.