As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB - CREW REPORTED SMOKE IN CABIN ALONG WITH SMOKE DETECTOR SOUNDING IN MID LT LAV. RAN BOTH ENGS AT POWER. COULD NOT DUPLICATE WITH ENG BLD WITH APU BLEED ODOR SENSED IN CABIN. REPLACED APU PER JIC 7952. RAN APU NO LEAKS NOTED AIR AND GEN OPS NORMAL.