I made a few mods to your Add-In, yes, I realize I can no longer apply your updates, unless you adopt these changes... :-)
You can view the results https://www.theoldfashionway.com/Xome then type in the Ticket Number 0387
Modified Order_Status.php,
Reduce the Title - $content .= '<h3>'.esc_html__("Check Your Repair Status", "computer-repair-shop").'</h3>';
Taxonomy - (It would be great if these were soft-coded)
Changed the words "Order" and "Work" to "Repair"
Changed the word "Case" to "Ticket"
Modified - $content .= '<p>'.__("Please enter your ticket# which you may have received via email or from our technician.", "computer-repair-shop").'</p>';
My last modification was to "simplify" the report via wc_print_functionality.php
After line 84
$content .= "<p class='aligncenter'>Thank you for your business!</p>";
goto end;
Added the tag befor the last return $content
end: