Step one-- Crank your car. Put it in Park with Parking brake applied.
Step two-- Get out and walk around car. Look for any sign of a light being
different or "brightness removed"
Step three- If one and two fail to en"light"en you, ask a trusted friend to look
around the car while you remain in the comfort of the interior. Ask him
to report back any odd light conditions.
Step four-- Drive to the local parts place and ask them to look for the troubled
light condition. Ask if they will replace the light if they in fact
find any light to replace.

If there in fact are no problem lights, I apologize for being sarcastic. Volvo does like to warn you of problems that do not exist and drive you crazy by repeating the false error.

GR