Why it's flagged. Some text has a color. Color may not survive into the book. Print is black and white inside unless your transmittal says Color interior.
How serious. Worth fixing for clearly colored text; Just noting for near-black.
How to fix it. In any editor:
- Select the text and set the color to Automatic or black.
- If the color marks something meaningful, like a link or an instruction to yourself, remove it or describe it in the transmittal's notes.
- Check the passage in a proof.
When to leave it. Near-black text is harmless: the build sets it black. If the color is deliberate, tell the studio. In the full report, correct as is stops it being flagged.