The Securities and Exchange Commission hasslapped $1.5 million in penalties, refunds, and interest on consultant Aon Investments USA Inc. to settle charges the Chicago firm misled the Pennsylvania Public School Employees’ Retirement System (PSERS) about errors that caused an exaggerated profit report for 2011-2020. The miscalculation was a subject of two federal investigations. It also figured in aboardroom fight over the agency’s investments that led to the 2021 retirement or resignation of top PSERS executives and a multibillion-dollar reallocation away from private investments by its govern…