As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING BOARDING PROCESS, SMOKE WAS DETECTED ON THE AFT CABIN WITH THE APU & BLEED ON. IAW TSM 49-00-00-810-921-A THE PART OF OIL REFILLING WAS DRAIN ALSO WAS CHECK FOR SIGNS OF OIL ON THE EXTERNAL AREAS & THE FLEXIBLE SEALS ON THE AIR INTAKE OF FUSER. FOUND NORMAL CONDITIONS IAW AMM: 21-31-00 PB 001. TEST OF PRESS CONTROL WITH APU BLEED WAS PERFORMED & NOT SMOKE IN THE CABIN.