As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS NR 1 ENGINE HAS EXPERIEINCED A SUDDEN TREND SHIFT IN CRUISE DELTA EGT AND CRUISE DELTA FUEL FLOW. TSR ISSUED. COMPLETED T/C 78273000 NO FAULTS NOTED FOR EITHER ENGINE. TSR STEP 1 COMPLETE. C/W TSR STEPS 2 6. NO DISCREPANCIES NOTED. REPLACED LT PACK FLOW CONTROL VALVE (PRECAUTIONARY PER TSR INSTRUCTIONS) REF MM 21 51 01. OPERATIONAL CK AND LEAK CK GOOD REF MM 21 51 01 400 805 002.