What was found
SMELL OF SMOKE AND CREW REST F/D SMOKE WARNING, SHUT OFF RECIRC FAN, SMELL WENT AWAY. OPERATED WITH SW OUT /OFF, REMOVED AND REPLACED LEFT LWR RECIRC FAN AND TESTED PER AMM21-2 5-07-400-801. RT LWR FAN ALSO REPLACED REF L/P 8615648. C/W FIM TASK 21-00-00-400-801. SOURCE ISOLATED TO RECIRC FANS. REPLACED BOTHS AIR FILTERS PER AMM 21-25-08-400-801. OK TO CONTINUE ROTABLE PARTS CHANGE WAS INDICATED - TT 1425880, S/N OFF 00786 FAN, AIR, CABIN OFF 25-2125-9-0003 0786, ON 25-2125-9-0003 1494.