[Resal007]

Thanks Russ. I have had a look and wasn't able to find any information regarding doors/latches from the manuals in your link. However, I have attached the door diagram from a Mazda 323 manual I found elsewhere. I am guessing the issue is with the door lock as shown in figure 8.

I am still wondering if I need to replace it, or if there is something I need to look at/fix?

Thanks