code/Debug/Model/Service.php
public function setFPCDebug($status)
    {
        if (!Mage::helper('sheep_debug')->isMagentoEE()) {
            throw new Exception ('Cannot enable FPC debug for this Magento version.');
        }

        $this->getConfig()->saveConfig('system/page_cache/debug', (int)$status);
    }
public function setFPCDebug($status)
    {
        if (!Mage::helper('sheep_debug')->isMagentoEE()) {
            throw new Exception ('Cannot enable FPC debug for this Magento version.');
        }

        $this->getConfig()->saveConfig('system/page_cache/debug', (int)$status);
    }
Enable/disables Full Page Cache debug

@param int $status
@throws Exception