What was found
ON FLIGHT 2766 THE CREW REPORTED, RECEIVED A NR 1 PACK OVERLOAD EICAS MESSAGE. THE FLIGHT ATTENDANT REPORTED A POSSIBLE ELECTRICAL BURNING ODOR IN THE CABIN. THE CREW TURNED THE PACK OFF FOR 3 MINUTES. THEY TURNED IT BACK ON AND IT OPERATED NORMALLY AND THE ODOR DISSIPATED. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED CMC DOWNLOAD PER AMM 45-45-00, NO MESSAGES. PERFORMED OPERATIONAL CHECKS AND GENERAL VISUAL INSPECTION OF NR 1 PACK IAW AMM 21-51-00. NO FAULTS, LEAKS, OR DEFECTS NOTED. DURING ALL OPS AND LEAK CHECKS, NO ELECTRICAL SMELLS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.