On my new (to me) P38 the barrel of the drivers door lock started spinning round and round, and then when I finally managed to persuade the key to come out the barrel slid almost all the way back into the door just by touch. I have been fortunate enough in the past not to have to familiarise myself with door anatomy... so, what will have failed? is it just a circlip fallen off inside? PO supplied a RHF door lock in a box of parts, so I suspect the lock was replaced but something was forgotten/ not fitted properly.