Door lock of driver door rotates round, opening and closing from outside is no longer possible. No ZV

Since today, the lock in the driver’s door rotates around in my 2003 he Kangoo. I don’t have a ZV. door can still be opened and closed from the inside via the passenger’s side. I dismantled the door panel but can’t dismantle the door handle. Presumably I first have to remove the window guide links to get to the left screw from the door handle. Recognizable from the outside is a 10 wrench screw. And a totally rusty torx screw. I need a new locking cylinder or you can still fix it with single parts. I still have a door handle with locking cylinder from the rear wing door.