Many of these films are available through FamilySearch so you don't need to wait to order one.
You need to note the details from the index:
LINCHEY, John 1816 Mar E 1 0106418
Then click on "Catalog" at the top of the page on FS, and put in the film number 106418.
That will take you to:
Then you need to wade through the parishes given at the top of the first page of each will/decree until you find Marown, and hopefully you will find his entry. The parishes are sometimes split into two or more areas.