Your box is now running
apache: httpd 2.0.52 28.ent i386
perl: perl 5.8.5 36.RHEL4 i386

i don't see any mod_perl port (httpd-perl /modperl/etc)

my guess is that mod_perl was compiled from source, against the old
perl and the old apache, because there is no mod_perl port in that
list, and when you rebuild perl or apache, you have to rebuild mod_perl.

you also likely changed perl versions-- which means your perl
installation is likely ****ed up

freebsd has an 'after upgrade' script for perl that migrates modules
to the newly installed version. look to see if redhat has something
similar.

in either event,