What was found
(CAN) NOTICEABLE SOCK SMELL THROUGHOUT ACFT, MOST NOTICEABLE IN FLIGHT DECK & STRONG SMELL VICINITY ON TAKEOFF. RETURNING, SUGGESTED DIVERSION, CAPTAIN DECLINED IN FAVOR OF DIVERTING ELSEWHERE. RESOLUTION IAW TSM TASKS 21-00-81-810-805A & TSM TASK 71-00-81-810-805A, TASKS CARRIED OUT. UNABLE TO DUPLICATE SNAG. THRU ENG GND RUNS & BLEED SOURCES, NO OIL EVIDENCE FOUND. RELEASED FOR MTCE CHECK FLIGHT.