Red lights are used to designate danger and yellow to urge caution. If you were to walk through every aspect of a customer's interactions with your firm, which stages or practices would merit a yellow light?
We may be reluctant to attach a red light to a particular area because we may not have enough information, but a yellow one simply advises caution. It means there should be careful study. Perhaps all is well, but the initial view is that more facts are needed before reaching that happy conclusion.
If you wait for the red lights to appear, you may miss spotting the yellow ones, and those less urgent indicators are good signs. Although they may be disturbing, at least they mean that the situation has not yet reached the status of "Red." You may be able to head off real trouble.
Look around right now. Where are the yellow lights?