Recommendations after long time storage

I have friends who have purchased an aircraft project including a 912ULS engine not used for many years.  It was manufactured in 2004 and used on a SEARAY.  All of my experience has been with three 912ULS, in three different airplanes but constantly maintained so I am interested in recommendations on what process is best used to repair/replace/overhaul an engine that has been out of service for years...Thanks

Serial Number 4427900 912ULS