As for the amber light mentioned at point #5, I've found something in my manual. It says that this light should be illuminated if the heaters are de-energized (means if theyre OFF). I'll add a ticket for this.

And I tried to reproduce an overheat in the packs, but wasnt succesful even with all bleed air valves open and both packs on. But I did a low-pressure start, it might happen if a high-pressure start is done with packs on. I'll check that.