As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT FUME EVENT DURING CLIMB OUT. DIRTY SOCK OR MOLDY CHEESE SMELL CONSTANTLY FROM 4000' THROUGH 10,000' ON CLIMB OUT. THIS SMELL IS CAUSED BY ENG OIL OR HYD FLUID LEAKING INTO THE PNEUMATIC SYS & THEN BEING THERMALLY DECOMPOSED. THESE FUMES CAN BE HARMFUL TO HEALTH.