What was found
NR 1 ENGINE 'ENG EEC C1' MESSAGE APPEARED ON EICAS. ENGINE OPERATION NORMAL. CREW COMMENTS: AUTOTHROTTLE OPERATING NORMALLY. DEFERRED AS PER MEL. PIMU FAULT 352-25 AND 353-25 OCCURRED ON FLT 909-08JUL. RANG OUT WIRING. W1P7 PIN G TO -A 241 OHMS. H TO F 302 OHMS, W2P3 PIN G TO -A 240.5 OHMS, H TO F 302 OHMS . D8340 PIN 1 T0 2 480 OHMS, 3 TO 4 146.5 OHMS, 090008D8344 PIN 1 TO 2 481 OHMS, 3 TO 4 147 OHMS, D8338 PIN 1 TO 2 47 9 OHMS, PIN 3 TO 4 154.4 OHMS, D8342 PIN 1 TO 2 480 OHMS, PIN 3 TO 4 155 OHMS. CREW OFF FLT 6870-12 REPORTED NR 1 EEC NORM AFTER 6 HOURS CRZ. NO MSGS. FOUND UPON ARRIVAL EICAS MESSAGES L PIMU & L EEC2. CHECKED NR 1 ENG EEC FOR LOOSE CONNECTION S-ALL FOUND TIGHT. BITE TESTED PMIU & FOUND NO INPUT FROM CHANNEL 'A' OR 'B'. SUGGEST CHANGING FMU DUE TO LONG HISTORY PER MM. REPLACED THE NR 1 ENG FMU.