As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR IN COCKPIT WITH APU ON & PACK 2 ON. DUPLICATED ODOR WITH NR 2 PACK OPERATING. FOUND HOSE DISCONECTED ON NR 2 PACK FROM FRONT OF DUAL TEMP CONTROL VALVE TO HEAD EXCHANGER, REMOVED AND REPLACED HOSES AND HARDWERE IAW AMM 21-51-02 GROUND RAN LEAK CHECK GOOD. NO ODORS NOTED.