What was found
FLIGHT COMPARTMENT AIR SMELLS LIKE DIRTY SOCKS ON CLIMBOUT. RAN APU WITH HEAT & RECIRCULATION FAN NOTICED ODOR. THEN RAN NR 2 ENGINE WITH BLEED AND HEAT AND RECIRCULATION FAN NOTICED ODOR. R & R RECIRCULATION FILTER IAW AMM TASK 21-22-22-000-801 AND 21-22-22-400-801. RAN RECIRCULATION FAN AND APU BLEED AIR. NO ABNORMAL ODORS NOTED IN CABIN OR FLIGHT DECK. GROUND RAN BOTH ENGINES WITH NR 1 AND NR 2 BLEED SELECTED TO ON. NO ABNORMAL ODORS NOTED.