What was found
(CAN) ON LANDING, THE CABIN FILLED WITH WHITE/GREY SMOKE LIKE THROUGH AIR VENTS/READING LIGHTS. AIRCRAFT STOPPED AT IDLE POWER, MIST SUBSIDED. PACK NUMBER ONE SHUT DOWN, MIST REAPPEARED WHEN NR 2 ENGINE POWERED UP. REPLACED CIRCULATION FILTERS, POWER ASSURANCE CHECK CARRIED OUT, ALL PARAMETERS NORMAL.