What was found
AIRCRAFT WAS NOT GROUNDED: AFTER TAKEOFF CLIMBING THROUGH 10000 FEET, MILD EXHAUST ODORS IN COCKPIT AND CABIN. SMELL DISSIPATED. REOCCURRED DESCENDING THROUGH 10000 FEET. ACCOMPLISHED JOB CARD 26L00021001 STEP 5, A, 1 FOUND (7GC) SELECTOR VALVE LINE LOOSE. TIGHTENED 1/4 TURN. CYCLED SYSTEMS. NO CABIN SMELL NOTICE AT THIS TIME. NO LEAKS NOTED AT THIS TIME.