As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE BEGAN SURGING 20 TO 80 PERCENT ON APPROCH TO SEA. ALL ENGINE INSTRUMENTS INDICATED THE SURGING ALONG WITH AIRCRAFT YAW. NR 1 ENGINE BROUGHT TO IDLE AND PROP WAS FEATHERED. AIRCRAFT LANDED IN SEA WITHOUT FURTHER PROBLEM. NR 1 NP PROBE REPLACED AND ENGINE OPS CHECKED GOOD ON GROUND RUN.