As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL260 AFTER THROTTLES RETARDED TO IDLE FOR DESCENT EXPERIENCED AUDIBLE COMPRESSOR STALL WITH PULSING VIBRATION. LEFT ENGINE EEC C1 STATUS MESSAGE. SURGE WAS DETERMINED TO BE <1.25 EPR AND CAUSED BY A FAILED 2.5 BLEED ACTUATOR. ACCOMPLISHED FORWARD THRUST SURGE INSPECTIONS, REPLACED THE 2.5 BLEED ACTUATOR AND PERFORMED OPERATIONAL CHECKS CONFIRMING REPAIR.