As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS #1 ENGINE TREND DATA HAS EXPERIENCED A DECREASE/INCREASE IN DELTA EGT AND DEC/INC IN HOT DAY MARGIN. DELTA FUEL FLOW AND DELTA CORE SPEED REMAIN STABLE. EGT INDICATION ERRORS ARE SUSPECTED. GROUNDED - YES. #1 ENG (S/N 804627) WAS REPLACED ON 05/23/23. NEW INSTALLED #1 ENG S/N 802158. REF ASA LOG PAGE 60707800.