As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BNA - FLT 0839 - EN ROUTE ORF/DFW DURING CRUISE, ACRID ODOR NOTED IN CABIN. AIRCRAFT DESCENDED TO FL 100 AND INTENTIONALLY DEPRESSURIZED AND ODOR SUBSIDED. AIRCRAFT DIVERTED TO BNA AND LANDED WITHOUT INCIDENT. PLACARDED GASPER RE-CIRCULATION FAN INOPERATIVE. SUBSEQUENTLY, REPLACED GASPER RE-CIRCULATION FAN AT DCA/26. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)