As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROP RPM & TORQUE FLUCTUATIONS BEGAN AT 400 FT PROP 970-1000, PROP CONTROL UNIT TORQUE 99.5-106%. RETURNED TO ANC. REPLACED NR 2 PCU FOR TROUBLESHOOTING. FOUND HIGH RESISTANCE IN PL SWITCH 6121 S12. R & R SAME & OPERATIONS CHECKED NORMAL IAW PSM 1-8-2 TR-ER-23 PART 7.