On arrival system was off. Indoor unit producing only 14 degrees cooling. No water safety's on machine. Water bypassing coil drip pan into blower compartment and draining into emergency pan. Checked refridgerant and found a subcool of 5 and a superheat of 30 indicating either airflow, a restricted txv or.an airflow issue. Customers power to home went out after maintenance was complete but before any deeper evaluation could be done. Explained that without power if he wanted to find out root cause of problems he would need to book an evaluation.