As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PREVIOUS CREW REPORTS OF BURNING SMELL IN FLIGHT DECK, CREW DID NOT REPORT TO MOCC. GROUND RAN A/C W/ #1 AND #2 ENG BLEED AND APU BLEED FOR 40 MIN W/ REF TO AMM 21-51-00-700-802-A. OPS CHECK GOOD. NO BURNING SMELLS NOTED AT THIS TIME. OK FOR SERVICE.