That is exactly what happened. The connector was bonded to the PCB already.
First thing I did, when I noticed that it partially detached, was re-bonding it with super glue and pressing the connector firmly down. Hoping that it would make electrical contact again. That did not work.
Then I undercut the connector with a thin wire saw, only half and there where no contact was. Then I could open the gap and melt a bit of solder on the metal parts. Pressing it together while the solder solidified. That worked. Finally I put some super glue around the connector foot. But I have only hope that this will lat long.
Thats why I try to find a replacement connector identical to the original and not to modify the housing of the dustbuster. They must be on the market, somewhere. If this is not a solution at the end then I will make alternatve connections.
Waiting for somebody who recognizes these soldered connectors with 2 parallel pins.