What was found
WHILE ACCOMPLISHING T/C 78273000, A FAULT CODE APPEARED FOR THE NR 1 ENGINE FAULT CODE 73-21271, THE ALTERNATOR VOLTAGE INPUT TO THE EEC WAS OUT OF RANGE, SHORT TIME. ACFT GROUNDED. RECENT FAULT, LEG 3 FOR FAULT MESSAGE 73-21271 WAS THE LATEST OCCURRENCE. B CHANNEL OF THE EEC ALTERNATOR IAW FIM 73-27, TASK 804. REMOVED AND REPLACED THE NR 1 STATOR-ALTERNATOR IAW AMM 73-21-08. LEAK CHECKED GOOD. DURING EEC ALTERNATOR INSTALL TEST, FOUND NR 1 ENGINE FAULT CODE #73-21271 ON LEG 0. REPLACED THE NR 1 ENGINE EEC, INSTALLATION TEST PASSED IAW AMM 73-21-60-400-801-F00. REPLACED THE NR 1 ENGINE J-8 HARNESS, INSTALLATION TEST PASSED IAW AMM 73-21-06-400-801-F00. REPAIR CONFIRMATION FOR FIM 73-27/804 PASSEED. NO MAINTENANCE MESSAGES. GROUND VERIFICATION SUCCESSFUL.