What was found
(CAN) ON TAXI-IN FROM PREVIOUS FLIGHT, FLIGHT-CREW WERE ADVISED OF A LOUD NOISE COMING FROM MID CABIN FLOOR AREA. WAS DETERMINED IT WAS THE EXHAUST BLOWER FAN. MAINTENANCE INSPECTED AND CLEARED FLIGHT FOR DEPARTURE. AFTER DEPARTURE AND DE-ICE FLIGHT-CREW NOTICED SOUND CAME BACK WITH A VERY FAINT ELECTRICAL ODOR. FLIGHT RETURNED BACK TO GATE FOR FURTHER INSPECTION. RESOLUTION REPLACED BLOWER FAN IAW AMM 21-26-00-040-006A, OPS CHECK OK.