What was found
(CAN) FUMES BEGAN ENTERING THE FLIGHT DECK AND CABIN. CREW DONNED OXYGEN MASKS, ONCE FUMES ACKNOWLEDGED. CREW TURNED OFF THE UTILITY BUSES AND THE FUMES DISSIPATED QUICKLY AND MASKS WERE REMOVED. FLIGHT CONTINUING FOR LANDING . RESOLUTION LEFT RE-CIRCULATION FAN REPLACED IAW AMM 21-25-01-401. OPERATION AND LEAK CHECK FOUND SERVICEABLE. TWO RE-CIRCULATION FILTERS L/H AND R/H REPLACED IAW AMM 21-25-02-401 (TC# 20190806004)