Got my phone back. As good as new.
Took the support contractor, rePod, eight working days to switch from
diagnostics to job well done. Heard from someone in Twitter he had made the
same experience.
Judging from a dead pixel, which was there from the beginning and is no
longer to be found even with a magnifying glass, the changed the display
unit.
For free, i.e. under warranty. \u/
Interestingly, support did a reset, and the phone arrived here with German
language settings.
And they used DHL. Which was rigging fast, phone got sent on Monday
evening, arrived on Tuesday.
So, in all, this has gone very well. I am really content with the process,
and the result. Only very minor nagging because I still don’t know why this
happened in the first place…