is www.manxnotebook.com/manxsoc/msvol04/v3p142.htm any use (excuse the poor scanning of the latin)
I can't see the will in the index but usually the Bishops wills would come unter the episcopal court but this didn't exist for some years after Parr's death (see www.iomfhs.im follow research for index to wills - however the index to early wills is known to be deficient - there is a new index in card form at Manx Museum - enquiries@mnh.gov.im)