As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, THE LEFT PROP WAS FLUCTUATING. REMOVED SPINNER, BETA CAP, AND TUBE. FOUND FLAT SPOT ON INNER O-RING. REPLACED BOTH O-RINGS. SET BLADE ANGLE AND REINSTALLED PROP CAP AND SPINNER. GROUND RAN THE NR ONE AND NR TWO ENGINES. CHECKED BLADE ANGLE AND FLIGHT IDLE FUEL FLOWS. OPERATIONALLY CHECKS GOOD.