What I would suggest is to "manually" close out your P&L to retained earnings by creating one JE that would do this and posting it on whatever day you decide to do it.
Then I would create another retained earnings account for the new ownership and I would then change the setup to close the financials at year end close time to this new account and proceed with business as usual after that until the end of 2008.
At the end of 2008, I would run the 2008 year end close and it should take the remaining years P&L balance (because you already closed out the first part for the old owners in the step above) to the new RE account and roll forward the BS accounts.
Is there a reason why you would not want to do this?