As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJC - INFLIGHT SMOKE IN CABIN. RETURNED TO SJC AND LANDED WITHOUT INCIDENT. FOUND APU LEAKING OIL. TIGHTENED LOOSE OIL LINE ON APU. REPLACED BOTH PACK SOCKS AND ACCOMPLISHED PACK BURN. REPLACED APU AT DFW PER WORK CARD 49 96 82. SYSTEM GROUND CHECKED NORMAL OPERATION.