SAN DIEGO -- An independent consulting firm is scrutinizing every aspect of the Preuss School at University of Califorina- San Diego after a grade tampering scandal tarnished the charter school's reputation, it was reported Monday.

The Preuss School is a nationally renowned public charter school that became entangled in controversy when a 31-page audit released in December found a number of unexplained grade changes.

Consulting firm MGT of America is now scrutinizing the school's policies and procedures, record keeping and staffing, The San Diego Union-Tribune reported. The consulting firm has been hired by UC San Diego, which houses Preuss.

A summary of the consulting firm's finding is expected by the end of May or in June, the newspaper reported.

The grade-changing scandal led Preuss Principal Doris Alvarez to resign. Interim Principal Scott Barton and school board President Cecil Lytle have not commented on the independent consulting firm's work.

UC San Diego Vice Chancellor Gary Matthews told the Union-Tribune that university officials hope the independent consultant's report will lead to changes at the charter school.

"We're hoping they assess our practices, our policies and procedures and identify things that need to be updated or changed," Matthews told the newspaper.