As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)A VERY NOTICEABLE SMOKE ODOR WAS DETECTED AFTER TAKEOFF. AIRCRAFT RETURNED TO BASE. INVESTIGATION REVEALED PACK #1 PRIMARY HEAT EXCHANGER REPLACED PRIOR TO FLIGHT. SUSPECT PAINT OR SEALANT EMITTING ODOR WHEN FIRST HEATED. BOTH PACKS OPERATED, NO ODOR DETECTED.