What was found
AIRCRAFT WAS GROUNDED: REJECTED TAKEOFF LESS THAN 40 KNOTS FOR ASSYMETRIC POWER ON TAKE OF ROLL. ENGINE #1 INDICATED 1.043 AND DID NOT RISE WITH THRUST LEVER. AFTER REJECTED TAKEOFF ENGINE #1 EPR 1.043 ENGINE #2 1.012. MAINTENANCE ACCOMPLISHED TSM 73-00-00-810-880-A. DURING STEP 4.A.6, MAINTENANCE FOUND EVIDENCE OF MOISTURE INGESTION POSSIBLY FROM PRIOR NIGHTS ENGINE WASH. REPLACED THE ENGINE ELECTRONIC CONTROL (EEC) ON THE #1 ENGINE DUE TO POSSIBLE MOISTURE INGESTION ISSUES. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 71-00-00 WITH NO DEFECTS NOTED.