As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PROPELLER RPM DROPPED TO 900 RPM AND RECOVERED TO 1380 RPM TWICE. BOTH TIMES ON APPROACH WHILE MAKING POWER ADJUSTMENTS. PERFORMED A VISUAL INSPECTION OF THE NR 1 ENGINE AND CONTROL CABLES, CLEANED ELECTRICAL CONNECTORS ON BLUE AND YELLOW HARNESSES, PERFORMED RIGGING OF THE NR 1 ENGINE POWER CONTROL CABLES IAW AMM 76-10-00. POWER CONTROL TEST NORMAL.