As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS CLIMBING THRU FL 220 APU BLEED OFF. FO SMELLED ODOR THEN FA CALLED SMELLING ODOR IN AFT CABIN. APU BLEED ON SMELL SEEMED TO SUBSIDE. MAINTENANCE ACCOMPLISHED SMOKE ODOR FUMES INITIAL TROUBLESHOOTING IAW JOB CARD 26L00021001. APU FOUND TO BE CAUSE OF EVENT. SUPPLEMENTAL INFORMATION: MAINTENANCE REPORTS APU WAS OFF WHEN THE OCCURRENCE HAPPENED, APU IS CLEAN AND DRY, NO SIGNS OF ANY OIL LEAKS IAW 26L0002002. OK FOR SERVICE. (CLOSED)