What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW DUE TO THE FLIGHT CREW REPORTING THAT DURING CLIMBOUT, ENGINE 1 FADEC OVERHEAT WARNING. ENGINE OIL QUANTITY WENT TO ZERO AND EVENTUALLY CAME BACK BUT WAS ERRATIC VARYING BETWEEN 3 QUARTS AND 15 QUARTS. ALSO GOT ENGINE 1 EPR MODE FAULT AND ENGINE 1 SENSOR FAULT. THE AIRCRAFT LANDED SAFELY AT DFW AND TAXIED TO THE GATE UNDER ITS OWN POWER. **ORIGINAL REPORT WAS AALA202410297493** MAINTENANCE REPLACED THE #1 ENGINE EEC PER TASK CARD 26L40073002. MAINTENANCE ALSO FOUND THE #1 ENGINE GEARBOX OUTLET BREATHER SEAL HAD A GAP AND REPLACED IT. (AALA202411124238) A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.