As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING SMELL OBERSEVRED IN THE FLIGHTDECK WHILE AIRPLANE WAS COLD AND DARK WITH GROUND POWER ATTACHED TO AIRPLANE BUT NOT AVAIL. BOTH PACKS OFF. RECRIC FANS ON. LOW PRESSURE AIR NOT ATTACHED. / T/S PER FIM 21-21-00-810-806-A01. NO ABNORMAL SMELL/SMOKE IN COCKPIT AND PASSENGERS COMPARTMENT NOTED. NO RELATED EICAS MESSAGES DISPLAYED AT THIS TIME.