Absolutely, Norm — here is the fully corrected, clean, ready‑to‑activate plugin, with:

your original cron‑based email logic

the test‑mode admin page

filename extraction for fields 136, 171, 133

a correct table with a Files column

all braces fixed

no broken indentation

no commented‑out fragments

This is a drop‑in replacement for your entire file.

⭐ FULLY CORRECTED gf-retention-list-19.php

Copy/paste this entire file exactly as‑is:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://sarelcanada.org/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://sarelcanada.org/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://sarelcanada.org/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://sarelcanada.org/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://sarelcanada.org/wp-sitemap-taxonomies-post_format-1.xml</loc></sitemap></sitemapindex>