What was found
DURING CLIMB OUT WHEN SELECTING BLEED VALVES ON , IN THE COCKPIT WE GET A NOXIOUS DIRTY SOCK EXHAUST SMELL, SMELL GOES AWAY WHEN DESELECTING NR 1 BLEED VALVE. R& R LT ENG NR 5, 6 AND 7 SCAVENGE TUBE O-RINGS IAW MM 72-01-50, NO SMELL NOTED AT THIS TIME, NO LEAKS NOTED.