Hello René
Those two chambers cannot exchanged in my opinion. The second stage is "controlled" by the second vacuum unit they always "pull" the second stage but this open not until you give more then half power via accelerator pad.
But the vacuum tube to this second vacuum unit was bendet so I replaced it by a new one 10 minutes before, maybe there was to less vacuum to the vacuum unit so the 2nd stage never opened correct.
We will see.
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