As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3748, CREW REPORTED ON TAKEOFF GOT AN OIL BURN OR DIRTY SOCK ODOR IN COCKPIT. ODOR DISSIPATED ON CLIMBOUT BETWEEN 10,000 FEET AND 15,000 FEET. NO EMERGENCY DECLARED. ACFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. ACCOMPLISHED ETN EM 72-034R4 AND REPLACED ZERO CARBON SEAL ON LT ENG. OPERATIONAL CHECK GOOD. NO ODOR IN COCKPIT OR CABIN. ACFT RETURNED TO SERVICE. (S)