Hi Gary,
WARNING: This should only be attempted on a COPY of your catalog/database file.
The database is a SQLite database and has an extension of .pmdb. You can use any SQLite tool to query this database but please close PMP first and make a copy of this database file to a separate directory and then use this copy just in case so you don't mess up your original database file. Look in the directory you created the catalog in to find this file.
I use FlySpeed SQL Query to look at SQLite databases. There is a free version available and is pretty good if you are knowledgeable about SQL databases.
I hope I have not upset anybody at Camerabits by providing this information