As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR IN COCKPIT AND COCKPIT DOOR AREA. SMELL DISSIPATES AFTER 30 SECONDS. OCCURRED DURING E1 START-C/A-TROUBLESHOT IAW FIM 21-20-00-810-801-A. WITH DIFFERENT APU/PACK/ENG COMBINATIONS, NOTICED SMELL COMING FROM COCKPIT VENTS WHEN PACK 1 SELECTED. SEE ITEM 3 FORM MORE T/S