As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, CREW REPORTED HEAVY BURNING ODOR IN COCKPIT, NONE IN CABIN. ASSOCIATED PACK OVHT MESSAGE DISPLAYED ON EICAS. MX TROUBLESHOT AND FOUND NR 1 ACM SEIZED. MX R & R NR 1 ACM IAW 145 21-51-00 WITH OPS AND CHECKED SUCCESSFUL. ACFT WAS APPROVED FOR RETURN TO SERVICE.