Debug and Repair RSS Feed from Wordpress Site

I have Wordpress blog on a private portal from which I want to post the latest posts to members. The RSS feed that I obtain from the blog stops after the 9th entry and more recent posts don't appear. I have done some customization on the site and may have broken something. I have some theories but would rather spend my time elsewhere. I am hoping to find someone who is intimately familiar with customizing Wordpress and feeds from Wordpress and could help me get the feeds repaired without losing the 2 dozen entries already posted on the blog.