What was found
AIRCRAFT WAS GROUNDED: DIRTY SOCK ODOR IN COCKPIT AT LOW ALTITUDE. REPLACED APU WITH SERVICEABLE UNIT IAW WORKCARD 72L31049008, OPS CHECK GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT WAS GROUNDED: DIRTY SOCK ODOR IN COCKPIT AT LOW ALTITUDE. REPLACED APU WITH SERVICEABLE UNIT IAW WORKCARD 72L31049008, OPS CHECK GOOD.