As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE EXPERIENCED POWER SURGES. *S/D* ACCOMPLISHED ENGINE BORESCOPE AND TROUBLESHOOTING FOUND VARIABLE STATOR VANES (VSV) OUT OF RIG, NO LIMITING DEFECTS NOTED IN GAS PATH AND VSV'S WERE PROPERLY RIGGED PER MAINTENANCE MANUAL. OPS CHECK OK.