34 C.F.R. § 110.33

(a) Initial investigation. ED investigates complaints that are unresolved after mediation or reopened because of a violation of the mediation agreement. ED uses methods during the investigation to encourage voluntary resolution of the complaint, including discussions with the complainant and recipient to establish the facts and, if possible, resolve the complaint to the mutual satisfaction of the parties. ED may seek the assistance of any involved State, local, or other Federal agency.

(b) Formal investigation, conciliation, and hearing. If ED cannot resolve the complaint during the early stages of the investigation, ED completes the investigation of the complaint and makes formal findings. If the investigation indicates a violation of the Act or these regulations, ED attempts to achieve voluntary compliance. If ED cannot obtain voluntary compliance, ED begins enforcement as described in § 110.35.