What was found
AIRCRAFT WAS GROUNDED: DURING CRUISE THE FLIGHT ATTENDANT CALLED TO REPORT SMOKE AND ELECTRICAL SMELL IN CABIN. WE RAN THE SMOKE, FIRE, FUMES CHECKLIST, AND SMOKE AND FUMES DISSIPATED. FLIGHT ATTENDANT SAID FUMES WERE STRONGEST IN ROW 8, 9, 10. AIRCRAFT DIVERTED TO GRR AND DECLARED AN EMERGENCY. TROUBLESHOT AND FOUND LEFT RECIRCULATION FAN AS THE SOURCE, REMOVED AND REPLACED LEFT RECIRCULATION FAN PER AMM 21-25-02 AND LEFT RECIRCULATION FILTER (AALA202207114807) PER AMM 21-25-01.