Two apologetic vice presidents of First Student transportation presented the Rockwood School Board on Thursday plans for improvements after a winter plagued with bus problems. Among the changes is an accelerated schedule for replacing buses — 73 new buses will be in place by the start of the next school year, said Al Muglach. Rockwood runs 120 bus routes every day. In addition, a new maintenance supervisor has been hired, and technicians will be undergoing more rigorous certifications, Wayne Gensler told the board. The company, which has been under contract with Rockwood since acquiring Laidlaw transportation in 2007, will also conduct a customer satisfaction survey….