What was found
DURING DESCENT, NOTICED FUMES IN COCKPIT THAT IRRITATED EYES, NOSE AND THROAT. FUMES WERE NOT AS STRONG IN THE CABIN BUT WERE MORE NOTICEABLE AFT OF OVER WING EXITS. NO EVIDENCE OF OIL LEAKING. REMOVED AND REINSTALLED THE AIR FILTERS IAW TASK 21-21-41. NO DEFECTS NOTED. AIRCRAFT WAS GROUNDED.