I downloaded the PCA file text (which requires Perl to run) from the site and amended the file so it was executable as per the instructions on the site.
# chmod +x pca
The severs I work on don't have internet access so I have to use the patchdiag.ref file text which is also available from the site (and changes on a regular basis, so go back and check periodically for updates).
Save the file to:
# /var/tmp
Then run the PCA script
# ./pca
Which produces something like this - usage guide is also on the website.
Very useful stuff!