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DAVENPORT, Iowa (AP) — A former University of Iowa wrestler has been sentenced to four months in federal prison for manipulating the school’s network so he could access its computers and change his and other students’ grades for classes.

Federal prosecutors for Iowa said Thursday that 23-year-old Trevor Graves was also ordered to serve two years of supervised release and pay $67,900 in restitution. Prosecutors say that’s how much it cost the University of Iowa to investigate and respond to the network breach.

Graves pleaded guilty in April to transmission of a command to damage a protected computer.

In a plea agreement, Graves admitted that from March 2015 to November 2016, he manipulated the university’s computer network and obtained professors’ usernames and passwords. He then changed grades for himself and five other students.