gform_pre_submission accessing field values

I have a hook here which works great (it looks for a field with the parameter name zip, and sets a hidden field based on the zip value):

[php]
add_action("gform_pre_submission", "set_email_notification_flag", 10, 2);

function set_email_notification_flag($form){

	//search for zip label and notification flag
	$formfieldzip="";
	$formfieldnotificationflag="";
	foreach($form['fields'] as $k=>$v)
	{
		if($form['fields'][$k]['inputName']== "zipcode") $formfieldzip= "input_". $form['fields'][$k]['id'];
		if($form['fields'][$k]['inputName']== "emailnotification") $formfieldnotificationflag= "input_". $form['fields'][$k]['id'];
	}

    if ( ($formfieldzip!="")&&($formfieldnotificationflag!="")) {
				$zipcode = $_POST[$formfieldzip];
				$_POST[$formfieldnotificationflag]=zipcodearea($zipcode);
	}
}

Now I have another hook for a specific form. This time I am trying to access the zipcode field of the address type advanced field.

[php]
add_action("gform_pre_submission_14", "set_email_notification_flag_14", 10, 2);
//specific email notification form 14
function set_email_notification_flag_14($form){
	$formfieldzip="input_19.5";
	$formfieldnotificationflag="input_25";
   	$zipcode = $_POST[$formfieldzip];
	$_POST[$formfieldnotificationflag]=zipcodearea($zipcode);			

}

I find that I cannot access the zipcode value (the variable is empty). The same holds for all the sub fields of any of the advanced field types. I cannot lay a finger on what I am doing wrong. Thanks.

Thanks! Should have figured that one!