As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED, BURNING SMELL FROM LEFT PACK AFTER TAKEOFF AND DURING CLIMB. NOTE: SMELL WENT AWAY AFTER LEFT PACK TURNED OFF. MAINTENANCE PERSONNEL REMOVED AND REPLACED WATER SEPARATOR IAW AMM 21-20-02. PERFORMED OPERATIONAL CHECK AT HIGH POWER ENGINE SETTINGS. NO BURNT ODOR NOTED. AIRCRAFT RETURNED TO SERVICE.