As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU BLEED AIR SMOKE NOTICED IN COCKPIT. INSPECTED APU AND BLEED, GROUND RAN ENGINE. RAN APU WITH BLEEDS SELECTED ON FOR OVER 30 MINUTES WITH NO SMOKE OR ODOR. CYCLED BLEEDS MULTIPLE TIMES AND RAN BLEEDS FULL HOT AGAIN WITH NO SMOKE. INSPECTED COCKPIT FOR ANY HIDDEN DAMAGE OR SIGNS OF SMOKE. NONE FOUND. CLEARED MEL 494. APU BLEEDS OK FOR SERVICE.