At the end of the 2006 season, the roof's bogie system was replaced at a cost of over $13 million. The 10 new, , bogies were paid for with money from the settlement between the stadium district and Mitsubishi Heavy Industries of America. Six of the bogies weigh , while the four others weigh . The work was completed by lifting sections of the roof approximately with Enerpac hydraulic lifts, while a crane replaced the bogies individually. "The bogies will last for the life of the facility," said Mike Duckett, executive director of the then named Miller Park stadium district. The project was completed by the start of the 2007 season.