How can I view the error log of a site using PHP-FPM?

Question

How can I view the error log of a site using PHP-FPM?

Answer

The PHP-FPM error log can be located in the following location:

# /home/USER/logs/DOMAIN_TLD.php.error.log

Note: USER represents the cPanel username for the account that owns the domain. 
DOMAIN_TLD should be replaced with the site in question. 

Where are the PHP error logs located?