As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ODOR IN CABIN ON POWER UP FROM IDLE DECENT @3000' MSL. ODOR LASTED 5 MIN IN BACK CABIN AND 5 SEC IN COCKPIT. PERFORMED TSM 05-50-00-810-831. RAN BOTH NR 1/2 ENGINES. RAN AND ISOLATED EACH PACK WITH EACH ENGINE AND APU. COULD NOT DUPLICATE PROBLEM. NO ODOR PRESENT. OK FOR SVC.