As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: STRONG, OILY/DIESEL LIKE ODOR IN COCKPIT SHORTLY AFTER TAKEOFF, AND DURING CLIMB OUT. ODOR DISSIPATED TO A FAINT TRACE AFTER APPROXIMATELY 10 MINUTES. FLIGHT ATTENDANTS REPORTED NO ODOR IN CABIN. MAINTENANCE REPLACED OIL LINE PER AMM 49-90-04 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.