As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BACK TO BLOCK DUE TO EICAS MESSAGE SMOKE CREW REST AND UNUSUAL SCENT DETECTED IN UPPER DECK. PERFORM FIRE TEST, NO SMOKE PRESENT IN CABIN. OIL SCENT COMING FROM APU. SUSPECT APU BEARING OIL LEAK ENTERING CABIN. REMOVED AND REPLACED APU IAW ATLAS WORK CARD 49-099-00-01. OPS CHK OK.