As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT THERE WAS AN OIL BURNING ODOR IN THE COCKPIT WHILE USING BLEED SYSTEM 1 AND BOTH PACK SYSTEMS TURNED ON. THE ODOR WAS ONLY PRESENT IN THE COCKPIT AND CLEARED ON THE GROUND WHILE USING THE APU AS A BLEED SOURCE. LANDED WITHOUT INCIDENT. MX REPLACED THE NR 1 ENGINE. OPS CHECKED GOOD WITH NO FURTHER DEFECTS OR ODORS REPORTED.