What was found
PILOT REPORTED A WET SOCK ODOR IN THE ACFT WHEN FIRST WALKED ON, BURNING EYES. MAINTENANCE PERFORMED TSM 05-50-00-810-831-A. PERFORMED APU INSPECTION IAW AMM 49-00-81-810-874-A, HYDRAULIC SYS INSPECTION IAW AMM 29-00-00-790-001-A, AND INSPECTED PACKS 1 & 2 . NO DEFECTS NOTED. NO FURTHER ODORS FOUND DURING APU AND PACK OPERATION. AIRCRAFT RETURNED TO SERVICE.