What was found
FLIGHT DECK HAS A DIRTY SOCKS SMELL.-PERFORMED IDENTIFICATION OF THE CAUSE FOR CABIN ODOR IAW TSM 05-50-00-810-831-A. PERFORMED OPS CHECK FOR PACKS 1 & 2 WITH APU BLEED, FOUND PACK 1 TO BE SOURCE OF ODOR, REF LP 3440567-2. MOC # 110495.