What was found
APPROX 2 MINUTES AFTER THE LANDING GEAR WAS DEPLOYED AND A FEW SECONDS BEFORE LANDING, FLIGHT CREW REPORTED AN (UNUSUAL SMELL) ON THE FLIGHT DECK. NO OTHER WARNING OR INDICATOR WAS NOTED. LANDING PROCEEDED AS USUAL. ON POST FLIGHT INSPECTION, HYDRAULIC RESERVOIR WAS FOUND TO BE ABNORMALLY LOW. FLIGHT DECK FLOOR WAS REMOVED AND BELLY WAS FOUND TO BE WET WITH HYDRAULIC FLUID. VISUAL INSPECTION APPLIED TO SYSTEM, A SEEPAGE WAS FOUND IN A GEAR DOWN PRESSURE LINE, THOUGH NO VISUAL MECHANICAL DEFECT WAS NOTED. AFTER MANY PRESSURE CYCLES MICROSCOPIC PERFORATIONS IN TUBE AT STA 96.00 BECAME EVIDENT. REPAIR WAS MADE UNDER OEM EO AND AIRCRAFT RETURNED TO SERVICE. (K)