It is in french, but it can be translated with babelfish or google.
http://www.forum-auto.com/pole-techniqu ... 293129.htm
There is also a guy on Ebay who does complete rebuilds or seal jobs:
http://cgi.ebay.com/ebaymotors/VW-Diese ... 0223161030
Phone #: 800-736-7440

He is offering IP overhaul for the VW pump for $375.00 I will contact him and inquire about a quote for the LD28 IP job.