As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIAGNOSTICS REPORTED THE NR 1 ENGINE TREND DATA SHOWED A SHIFT IN EGT HOT DAY MARGIN ALL OTHER PARAMETERS NORMAL. ACFT GROUNDED. ACCOMPLISHED A NR 1 ENGINE EGT CLEANING IAW AMM 77-21-00-140-801. ACCOMPLISHED EGT AND T49.5 SYSTEM INSPECTION IAW AMM 77-21-01-200-801-F00. NO DEFECTS. ALTERNATE DEACTIVATION PROCEDURES APPLIED AND REVERSED IAW CHAPTER 5 SECTION 7 TABLE 3.