As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT LIGHTS FLICKERED ON & OFF, A/P CYCLED. ALL GEN LOADS VARIED FROM 18 KW TO 30 KW, SIMULTANEOUSLY APPROX 1/2 SEC IN DURATION. GEN VOLT STEADY; FREQUENCY SPIKED WITH GEN SPIKES. INITIALLY OCCURRED AT HIGH POWER SETTINGS. STABILIZED ON POWER REDUCTION DURING DESCENT AND THEN REOCCURRED, WITH SPEED BRAKE DEPLOYED LIGHT CYCLED FROM ARMED TO DO NOT ARM.