i had the same issue a couple of years ago.
But I still drove my car and just skip the 2nd gear. I go from 1st to 3rd gear for about a month. Then the 3rd gear started grinding as well..
We opened up the tranny, and discovered lots of metal shavings when we drained the oil.
I ended up buying a new tranny.
I believe one guy from solstice forum, had the same issue.
http://www.solsticeforum.com/forum/f43/2nd-gear-synchro-pics-71831/he will try those stronger Carbon Fiber lined synchros from AR5 hummer H3
not really sure if it will be compatible tho.......