LEATHER SPA NYC RECS

I recently bought my dreamed vintage yellow Chanel in lambskin and sadly it got color transferred from a denim blouse. What places would you guys recommend? I went to Leather Spa at Saks and they recommend the full spa thing (cleaning, touch ups and conditioning). It has a stain mainly in the back but they said they will condition the whole bag. Has anyone done something similar with them? I'm just scared it will ruin the color, texture of the bag (its buttery feel, but the guy told me it could use some conditioning)