As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON APPROACH, VERY STRONG ELECTRICAL SMELL AT 2500 FEET SMELL WHEN AIII SELECTED WITH GEAR DOWN FLAPS 15 SMELL REMAINED STRONG THROUGH LANDING AND TAXI TO GATE AUXILIARY POWER UNIT WAS OFF. FOUND AUXILIARY POWER UNIT START CONVERTER UNIT DAMAGED. REPLACED AUXILIARY POWER UNIT START CONVERTER UNIT PER AMM 49-41-61-400-801.