As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ELECTRONICS SMELL IN FLIGHT DECK FOLLOWED FIM TASK 21-20-00-810-801-A UP TO BLOCK DIAGRAM 10 BLOCK 2 SUBTASK 813-019-A STOPPED AT BLOCK 3 SUBTASK 813-051-A STATIC TORQUE CHECK. GROUND POWER UNIT SUSPECTED SMELL. NO SMELL DETECTED ON APU OR AT THIS TIME