Modifications made to address the overheating issue included improving the airflow through the powerhouse, partial return to the original design of through-rotor cooling; changing the way water passes through the cooler and tube fin spacing; changing the core air duct configuration; and making the coolers slightly larger. As a result, the volume of air circulating within the unit has been increased by approximately 28 percent to 25 m3/s. Also steps were taken to improve the airflow though the powerhouse as described below.