What was found
CREW REPORTED SMOKE IN COCKPIT AND CABIN AREA WITH AN ACRID SMELL WITH VISIBLE SMOKE THE THROUGHOUT COCKPIT AND CABIN PERFORMED CONDITIONAL CHECK REF AMM 05-51-56-200-801. PER TOMC WE REPLACED RECIRC FILTERS. ALSO, REF FIM 21-00 TASK 830, PARAGRAPH Q. PARTS USED: 29-2124-3-0006,QTY :1 NO ODOR OR ACRID SMELLS AFTER FILTER CHANGE. FOR CLARIFICATION: PERFORMED CONDITIONAL CHECK REF AMM 05-51-56-200-801. USED FIM REF. 21-30 TASK 830. COULD NOT DUPLICATE SMOKE OR SMELL. PER TOMC WE REPLACED RECIRC FILTERS AS A PRECAUTION REF AMM 21-25-01-400-801. CONTINUED WITH FIM 21-30 TASK 830, WE PERFORMED ENGINE RUNS AND PACK BURN OUT, INSPECTED APU COMPARTMENT AND AVIONICS COMPARTMENT. NO EVIDENCE OF SMOKE OR ODOR.