Door lock woes - 93 W124

[Scooter76]

Hi folks...I'm a newbie here to the forum, having just purchased my first MB, a 93 300E with 179K. My central locking system, in terms of the electrical and vacuum components, seems to work fine. However, there appears to be an issue with the mechanical linkage in the drivers door, as it can still be opened from the outside, even when the button is down, thus activating the alarm.

Can anyone tell me what I might expect to find inside the door? Is it likely that something is broken, or maybe just bent? If anyone has experienced anything similar on a 124, I'd love to hear about it...thanks!!