Probably faster to look at their website:
Liverpool District Probate Registry
Scope 1858-1940:
Repository Lancashire Record Office
Record Reference WLi/1
"Please note that we do not have copies of wills, we only have the indexes to probate granted in England and Wales 1858-1956."
www.gmcro.co.uk/family_history/wills.htm

As I wrote, the earlier ones are held at CROs, in this case either Cheshire Record Office or the Lancashire Record Office.

Sue