What was found
AIRCRAFT WAS GROUNDED: ON DESCENT INTO CLT AT 5000FT STRONG ODOR THROUGH BLEED AIR IN FLIGHT DECK. ELECTRICAL TYPE SMELL AND FLIGHT ATTENDANTS REPORTED STRONG SIMILAR SMELL IN THE AFT GALLEY AT SAME ALTITUDE. SUBSIDED AFTER LANDING THEN AGAIN BUT MORE SUBTLE AT GATE. SUSPECT BAD RECIRCULATION FAN. REMOVE AND REPLACED BOTH LEFT HAND (AALA202406172483) AND RIGHT HAND (AALA202406188726) RECIRCULATION FANS, PER AMM 21-25-02. RMOVE AND REPLACED BOTH RECIRCULATION FILTERS LEFT HAND (AALA202406189260) AND RIGHT HAND (AALA202406184789), PER 21-25-01.