As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WOULD NOT START. TWO ATTEMPTS MADE ON GROUND POWER AND ONE ATTEMPT ON BATTERY. APU RPM WOULD NOT GO ABOVE 18 PERCENT. OBSERVED SMOKE COMING FROM INTAKE BELOW NR 1 ENGINE, R & R APU STARTER MOTOR IAW AMM 49-41-07. OPS CHECKED GOOD, COMPLETED THREE APU STARTS. RAN APU AND PACKS FOR 30 MINUTES. NO OVERTEMPS NOTED.