As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK CAUSES FUMES IN COCKPIT WHEN SELECTED TO MOMENTARY WARM TEMP. TWO CREW MEMBERS NOTICED DULL HEADACHE AND ONE CREW MEMBER COMPLAINED OF BURNING EYES. RAN LEFT PACK WARM POSITION WITH NO FUMES OR OTHER DEFECTS NOTED PER B727- 200MM 21-55-000-5. OK FOR SERVICE.