As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING A CHECK-FLIGHT, POST 15 YEARS CHECK AT MAINTENANCE FACILITY (2 MONTHS DOWNTIME), CREW NOTICED DURING TAKE-OFF ROLL (ON GROUND AND SHORTLY AFTER ROTATION) A HEAVY OIL SMELL IN THE AFT CABIN/AFT LAV. THE OIL SMELL DISAPPEARED DURING FLIGHT. NO EMERGENCY PROCEDURE OR SIMILAR APPLIED. TROUBLESHOOTING IS ON-GOING. (TC# 20180925008)