What was found
MAINTENANCE PROBLEM INCURRED. FLIGHT DIVERTED. NR 1 EPR BLUE ARC INDICATION FLUCTUATING. ALL OTHER ENGINE PARAMETERS NORMAL. REPLACED NR 1 EIU, NR 1 FWC, NR 1 LGCIU (P/N 664700500A4D - 274). ALL CHECK OK. ACCOMPLISHED AIRCRAFT TAXI CHECK, NO MESSAGES.