I think its title is castletown mortgages - however the indices to this and N/S side sales are on mormon microfilm but you need access to the original deeds/mortgages at museum - no immediate plans to digitise them - some 300+ marriage contracts are summarised on my cd rom (mostly northern parishes pre 1723), + many deeds so you can see what info they give

In reality you need easy access to several films for lib assed + lib vast + often the deeds + wills - if you have land on abbey rent then some of the volumes of lib mon (which combines the function of lib assed + lib vast) are filmed but a key volume is not; if you are unlucky to get bishop's barony then suggest choose other ancestors!

thus to be realistic you need to work at museum or have someone on tap who can get you copies of the deeds.