What was found
DURING INITIAL CLIMB, WE SMELL A STRONG FUMES SITUATION, WAS IMPROVING AFTER DESELECTING THE VENTILATION SYS WHICH WAS RESTARTED SUCCESSFULLY. AFTER 2 HOURS & 30 MINUTES STRONG NOISE UNDER THE FLOOR THE AFT GALLEY APPEAR & COMING WORSE RAPIDLY & THE FUMES BEGAN TO REAPPEAR ON ALL ACFT. IAW TSM 05-50-00-810-831-A IDENTIFICATION OF THE CAUSE OF CABIN ODORS OR SMOKE INSPECTION CHECK WAS PERFORMED. THE REASON WAS THE EXTRACT FAN STUCK. IAW TASK AMM 21-26-51-000 400-001-A EXTRACT FAN WAS REPLACED. TESTED SATISFACTORY. PN EVT3454H SN OFF 12203 SN ON 06585.