I suspected moisture in the junction box and it was... and more.
Have glued the piece back with Super Glue and so far it seems to work.
The motor still did not work and after dismantling more parts I could feel that the motor was not rotating, at all.
Suspected a bearing failure but it was worse. The rotor and stator were glued togeteher by rust. Bearings are fine!
After de-rusting I put the parts together and it works!