As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG SMELL NOTICED BOTH INSIDE AND OUTSIDE AIRCRAFT SMELL STARTED AFTER POWER TRANSFER TO APU AND PACKS WERE TURNED ON. GROUND PERSONNEL ALSO REPORTED STRONG SMELL AND REPORTED SMOKE COMING OUT OF AN APU VENT. INSP APU AREA FOUND STARTER MOTOR W/STRONG BURNT ELEC ODOR. REPLACED STARTER ALSO FOUND RELAY STUCK CLOSED K197 REPLACED K19 AND K117 RELAYS. ALSO, REPLACED APU BATT. RAN APU, OPS CK OK. REMOVED MCO/PLAC.