As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE UNRESPONSIVE AT ALTITUDE. PERFORMED BITE CHECK OF#1 EEC AND NO FAULTS CURRENT OR IN HISTORY NOTED BUT NO CHANNEL B ON GROUND TEST. REMOVED AND REPLACED #1 EEC REF AMM73-21-60. ALSO FOLLOWED FIM 73-21 801 FOR EEC DATA NOT AVAILABLE. ALL TESTS PASSED INCLUDING T/O POWER ASSURANCE CHECK TASK 71-00-00.