+1 on the sorbate--treat with campden & sorbate as you usually would. I have had good results with wine conditioner but I have seen posts on here that suggest you want to stop just a tad drier than you might want, because the wine seems to get a bit sweeter as it ages in the bottle. I do know that I left my Christmas wines just a little drier than I would have sweetened them for myself, and when I gave them as gifts, several people complimented them and said "Nice dessert wine!" I don't know if the wine got a little sweeter or I just like my wine sweeter than other people--probably both.
Hickory Glynn Winery & Brewery