XC60: Metallic knocking noise in shock absorber

Today I was at the , because lately while driving through potholes or gully lids (thanks, dear winter, for this rich gift …) there was a clear slap on the left front. After a test drive the master could hear the sound also (which miracle, mostly he hears nothing), but he could not locate the problem. A shock absorber test returned normal values. On the stage there were also no loose or knocked out parts to see or feel. BUT: The computer gave information: There is a measure of Volvo “Metallic knock noise shock absorber”. Well, that was ordered now, and then we will continue to see. Does anyone know the problem or the measure? Hope, with the exchange the problem is eliminated … Greeting from the erzbmw