As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GETTING AN INTERMITTENT ACRID "DIRTY SOCK" ODOR IN CABIN DURING FLIGHT WITH APU OFF. R & R THE WATER SEPARATOR COALESCER IAW MM 21-21-03, 21-50-00. THE OPS AND LEAK CHECKS ARE SATISFACTORY. THERE WAS NO EVIDENCE OR ANY OIL IN THE WATER SEPARATOR.