Siemens evaluated the photos. They show like electrical discharge. Especially the wheel where a pattern is visible support this where you can see the line of contact and then several teeth without marks. Picture one on page 8 the so called tiger stripes that are typical for electrical discharge are also visible.
Electrical discharge is never good but a fairly slow process. On some of the pinion pictures possible wear can be present as well. It is almost impossible to determine by the pictures. Wear can happen when the oil film is not capable to separate the teeth’s and there will be metal to metal.