What was found
NR 1 ENGINE LONG TERM FAULT NR 77-21171, THE N1 SIGNAL IS OUT OF RANGE. ACFT GROUNDED. ACCOMPLISHED FIM 77-11, TASK 801, FAULT MSG PRESENT ON FLT LEGS 1 THROUGH 10, BUT NOT ON LEG 0. RESISTANCE CHECKED AT N1 SENSOR 58.9 OHM COMPARED TO 58.4 FOR CH A. RESISTANCE VERIFIED AT EEC J8 CONNECTOR. R & R N1 SPEED SENSOR PRECAUTIONARY, REF MM 77-11-01 LEAKED AND OPS CHECKED NORMAL, REPAIR CONFRIMATION IAW FIM.