TurboTax business uses the federal tax return to decide which state tax return you'll file. I'm not sure how you switched from filing a corporation return to a partnership return but you did.
The good news is that filing the partnership return has probably satisfied your filing requirement with the feds and with California. So the return can't be late now.
You need to amend the return. You'll need to amend the federal and then the California. You can do that through TurboTax but you may have to create a corporation return like you usually file and then amend that.
Here is the California amendment page.
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