What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF LEFT ENGINE EXHAUST GAS TEMPERATURE DISPLAY TURNED RED. HIGHEST OBSERVED TEMPERATURE WAS 962 DEGREES. AFTER 1 MINUTE TEMPERATURE RETURNED TO NORMAL AFTER RETARDING THROTTLE. FLIGHT DECLARED EMERGENCY AND LANDED OVERWEIGHT. LANDED WITHOUT SHUTTING DOWN ENGINE. CAUSE FOR EXHAUST GAS TEMPERATURE OVERTEMP IS ENGINE DETERIORATION. IT IS THE 4TH REPORTED EXHAUST GAS TEMPERATURE OCCURRENCE. **SUPPLEMENTAL REPORT FOR AALA202109107843: REMOVED AND REPLACED THE NUMBER 1 ENGINE AS PER MCM CARD NUMBER 08L40072003** (CLOSED)