Hello friends, thank you for you help so far!
I ran apt-get update and apt-get upgrade yesterday and there was some info about possible missing firmware /lib/firmware/tigon/tg3......for module tg3.
Apparently the missing firmware is found in non-free source, and decided not to add this to my sources list yet. So I did nothing, but ran the same apt-get update and apt-get upgrade today, and I got a different result - no sign of the missing firmware like there was yesterday!
How / why would this have happened!??! Any insight or explanation would be appreciated!