What was found
DIRTY SOCK ODOR DURING CLIMB AND CRUISE, SUBSIDED DURING DESCENT AND APPROACH. COCKPIT TEMPERATURE CONTROLLER NORMAL 12 O'CLOCK POSITION. CABIN TEMPERATURE CONTROLLER FORWARD AND AFT IN THE 9 TO 9:30 POSITION. MAINTENANCE ACCOMPLISHED JC 26L00021001, AND 26L00021002, FOUND APU TO BE THE SOURCE OF THE ODOR, APU INOPERATIVE. MAINTENANCE REPLACED THE APU IAW JC 26L31049003 AND PERFORMED A SATISFACTORY OPERATIONAL CHECK.