What was found
DURING LANDING A RECIRC FAN FAULT MESSAGE OCCURRED, AFTERWARDS THE CREW NOTICED A SMOKE SMELL AND ONE OF THE FLIGHT ATTENDANTS AND SOME OF THE PAX SAW SMOKE IN THE CABIN. THE A/C LANDED SAFELY WITH NO OTHER ISSUES. RECIRC FAN FAULT STATUS MESSAGE IN FLIGHT AT 1000 FEET SMELT BURNING SMELL FLIGHT ATTENDANTS REPORTED SMELL AND SMOKE IN THE CABIN / DEFERRED BOTH RECIRC FANS PER MEL 21-22-01-2 CAT C. C/W M FUNCTION BY PULLING AND COLLARING CBP 1 A5 AND CBP2 A5. INTEGRATED MDC AND FOUND MULTIPLE B1 CODES FOR RECIRC FAN 1. REMOVED AND REPLACED #1 RECIRC FAN IAW CRJ900 AMM 21-22-10-000/400-801. LEAK CHECK AND OPS CHECK GOOD AT THIS TIME. CLOSED CIRCUIT BREAKER A5 CBP1 AND A5 CBP2 AND B11 CBP2, RETURNING THE RECIRC FANS AND GALLERY HEATER TO SERVICE.