As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB NR 1 PROP RPM FLUCTUATED FROM 850 TO 860 FOR APPROX FOR 3 SECONDS AND RETURNED TO 850 RPM. REPLACED NR 1 PCU IAW AMM TASK 61-20-11-000-801 AND 61-20-11-400-801 AND TASK CARDS NR 661001, 661002, 6710008, 6710005. OPS CKS GOOD. ALL INDICATIONS NORMAL, ACFT OK FOR SERVICE.