As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED NR 4 PROPELLER RPM FLUX OUT OF LIMITS IN BOTH NORMAL AND MECHANICAL GOVERNING. SHUTDOWN NR 4 ENGINE AT 1953Z IAW AOM ESP. REPLACED NR. 4 PROPELLER VALVE HOUSING IAW HN61135. OPS AND LEAK CHECK NORMAL IAW HN7101. LP 16472, ITEM 1.