«I'm a bit surprised that they even tried rather than simply replacing a bigger component. Or maybe they did, and the replacement part was a dud.»
They did replace a bigger component — actually two. The invoce is really detailed and they included part replacement serial numbers. Googling I found they are the “3rd and 4th group assy” — the word “assy“ is pretty new to me, but if I'm not wrong is more or less a lens group, right? In the invoice they are labeled “STEADY SHO(T)” and “3RD IRIS” and the labour description includes "replacement of internal lens groups” (translated).
When they looked at the test I sent them they were puzzled and asked whether I suspected a bump during delivery. The packaging indeed was not showing any sign of that.
