I am the proud new owner of a 67 plate 595! After 10 years away from the 500 i am back in the fold! (And with the same issue i had with my first one, a rattling tailgate) =(
Panda 169s sometime get that rattling tailgate. Have to tried adjusting the door catch to pull it in a bit closer? Also check the parcel shelf. Mine has lost the hinge rubber cap on the driver's side so that rattles without some padding.