Where a federal law did not pre-empt the application of a state consumer protection law to a student loan servicer when the servicer voluntarily held itself out as an expert working in borrower’s best interest.The 7th U.S. Circuit Court of Appeals reversed a decision by Chief U.S. District Judge Nancy J. Rosenstengel, Southern District of Illinois.Nicole Nelson financed her education with federal student loans. Great Lakes, Nelson’s loan servicer, manages the borrowers’ accounts, processes payments …