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I am at a loss...

I am doing an AJAX POST to Symfony. In the PROD environment (app.php) I get a 403 FORBIDDEN status code (user does have access), but the response contains an error message that is generated inside the controller for one of the POST parameters that are empty. I have determined that $request->request->all() is empty. Switching to the DEV environment (app_dev.php) I get a 404 NOT FOUND response. Browsing to the route on both PROD & DEV does not provide either 403 or 404 responses. The AJAX POST is to the same server (no cross-domain issue) and the route for the AJAX POST is generated by Symfony.

A couple of notes:

1) The code works flawlessly on my localhost. The problem only occurs on our production server. Security.yml is set up correctly, and I have deactivated the custom ExceptionListener. The 404 NOT FOUND error on PROD is the standard Apache 404, and not the Symfony 404 "Route Not Found". However, when I enable my custom ExceptionListener I get the 404 Response from that, and not the Apache 404.

2) Our hosting provider upgraded our production server from EasyApache 3 to EasyApache 4. Along with this some of our PHP config settings changed. I had to have them re-enable SOAP and iconv in the PHP config. Because it works flawlessly on my localhost, I deduce that it HAS to be something to do with this, but I am going to have to pinpoint the exact issue for them to be able to fix it. I suspect something in the .htaccess settings (RewriteMod), but I do not know a lot about this.

3) There are a hundred different routes that are linked to controller functions, 90% of them are being accessed via AJAX POST. All of them work perfectly except this one (that we have found so far).

Controller Function: