As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: MODERATE BURNING PLASTIC ODOR MOST OF THE FLIGHT AROUND ROW 25. WHILE ACCOMPLISHING INITIAL TROUBLESHOOTING SMOKE ODOR FUMES TASK CARD 26L00021001, FOUND IN-SEAT POWER SUPPLY UNIT TO HAVE A BURNT SMELL WHEN COVER REMOVED. REMOVED AND REPLACED IN-SEAT POWER SUPPLY UNIT PER AMM 25-21-38.