Both 112 & 113 are still using LM2500s. China has imported some sort of commercial LM2500s and they can produce many parts for maintenance. Moreover, the 052s usually cruise with diesels anyway.
Don't think so. After Tianamen, US embargoed these engines and their spares. The second ship was finished wtih Ukrainian DA80 gas turbines. I would think by 2012, both ship's gas turbines would have been changed completely to domestic.