As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 PROPELLER SURGED ON APPROACH AFTER NP 1020, NORMAL, SELECTED. PROPELLER WOULD PULSE BETWEEN APPROXIMATELY 960 TO 1020 RPM. AS PRECAUTION, R & R NR 1 OVERSPEED GOVERNOR IAW AMM TASKS 61-20-26-000-801/ 61-20-26-400-801. OPS CHECKED GOOD. RAN BOTH ENGINES AT HIGH POWER FOR SEVERAL MINUTES WITH NO SURGING NOTED. NO LEAKS NOTED. NO FAULT CODES FOUND IN CDS. RETURNED TO SERVICE.