As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRICAL BURNING SMELL REPORTED BY FLIGHT ATTENDANTS DURING TAXI IN ABOUT 1 MINUTE AFTER APU START. PERFORMED T/S PER AMDS W/C 0550-2001. NO SOURCE FOUND. PERFORMED EFIM OF ODOR SOL # 1-8451. COMPLETED REPORT AMDS 0550-9001-A220 AIRCRAFT OK FOR SERVICE REF MD 0640250. (LP# 5134151)