What was found
ON PREFLIGHT, FOUND #1 EGT DISPLAY WITH RED BOX. GROUNDED - YES. FOUND EGT PEAK 955.0 AND EGT RED 950.0 FOR 0.6 SECONDS. TEMP PLOTTED ON FIGURE 603 IS AREA "A" EGT FAULTS LOGGED 77-20861. FOUND S3 AND S4 DASHED OUT. CHECKED CONTINUITY THROUGH S3 AND S4 AND FOUND HIGH RESISTANCE THROUGH BOTH. FOUND CONTINUITY GOOD THROUGH J10 HARNESS AND RESISTANCE GOOD THROUGH PROBES AT CJ10 CONNECTION. VERIFIED ONLY HIGH RESISTANCE ONCE J10 AND CJ10 RECONNECTED. DUE TO J10 PREVIOUSLY BEING REPLACED, REPLACED CJ10 HARNESS. OPS CHECK GOOD REF MM 73-21-06-400-803-FOO. ALTERNATE DEACTIVATION PERFORMED IAW CHAP 5 TABLE 3 ITEMS 1,4,7,8. 5 C/B'S PULLED AND RESET.