As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT A BURNING BLEED AIR SMELL WAS COMING INTO THE COCKPIT ON TAKEOFF BUT HAD DISSIPATED ENTIRELY AFTER ROTATION. BOTH COCKPIT AND CABIN HEAT WAS SET AT FULL COLD. MAINTENANCE CLEANED THE WATER SEPARATOR SOCK. SYSTEM OPERATIONAL CHECKS WERE NORMAL, AND THE AIRCRAFT WAS RETURNED TO SERVICE.