It could probably be fixed but it would be a bit of a bodge; it would be difficult to provide enough strength to a repaired circuit board such that the Line In/Out socket could still be used without it breaking again.
If it were mine I would look for a replacement PCB from a ‘donor’ unit and replace – or get someone qualified to do so.
I think Beoparts may have the whole connecter panel for sale so you may wish to contact them: https://beoparts.com/2016/05/27/connector-socket-bay/