As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE ROLLED BACK. AT 38,000 APX 5 MIN INTO CRUISE PHASE. LEFT ENGINE ROLLED BACK 10% PLUS. OBSERVED LEFT ENGINE GAUGE AND CONFIRMED WITH AIRCRAFT YAWNING MOMENT. CLEANED AND INSPECTED N2 MONOPOLE CONNECTOR OF DEBRIS. PERFORMED VERIFICATION OF DEEC OPERATION IAW LMM 76-10-02. ALL CHECKED GOOD. PERFORMED ENGINE RUNS WITH NO DEFECTS NOTED.