OK, makes sense now. Angelo's info:
Quote Originally Posted by angelozip View Post
....... My 3790 is recent, serial number 381xxxxxxx (sorry, forgot the rest, lol) PCB: V8 8GB 035 DA TC GM. The 3790 of TadFerreira is s/n 380xxxxxxx. .....
But i should have realised that was a UID number not a S/No. My UID for older unit is 380xxxxxxx. My newer unit has 381xxxxxxx.