I can try to help but I have my own work too I'm afraid. I only volunteer here.
The last thing you can do as far as I'm aware is to try to turn errors on at run time. That means to give an instruction at the start of a PHP script. Try this at the top of your PHP file. If you have lots of PHP files working together, put it in either a header file or functions file - you'll need to have a look around your website folders to find a suitable spot.
Code:
error_reporting(E_ALL);
ini_set('display_errors', '1');
be aware that this won't show *all* PHP errors, but it should show enough to point you in the right direction.
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