As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE HAS EXPERIENCED A LARGE, SUDDEN INCREASE IN CRUISE DELTA EGT. FUEL FLOW AND CORE SPEED HAVE REMAINED STABLE. ACCOMPLISHED T49.5 PROBE AND EGT SYSTEM INSPECTION, REF MM 77-21-01-200-801-F00. FOUND SLIGHTLY HIGH RESISTANCE BETWEEN PIN H AND PIN LOWER CASE A OF 15.6 OHMS ON CONNECTOR J9 DP0909. CLEANED CONNECTOR REF MM 70-70-01, SUBSEQUENT READING OF 5.95 OHMS AFTER CLEANING IS WITHIN LIMITS. ALL INSULATION RESISTANCE VALUES WITHIN LIMITS.