As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT THROUGH 7,000 FEET, LEFT ENGINE BEGAN TO SURGE REDUCING POWER. CORRECTED SURGING, BUT WHEN CLIMB POWER WAS AGAIN APPLIED, THE SURGING RESUMED. RETURNED LAX. REPLACED LT EEC. REPLACED LT PMA STATOR. REPLACED 14 STG CONVERTER VALVE AND 14 STG VALVE. ALL CKS NORMAL.