As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, NR 3 GENERATOR FREQUENCY WENT TO 420 AND BUS 1 AND 2 TRIPPED WITH OVEREXCITE INDICATION. DECLARED AMBER ALERT AND RETURNED TO TUL. *S/D* REPLACED NR 3 GENERATOR AND CSD. GENERATOR SYSTEM OPERATIONAL CHECK NORMAL. GENERATOR P/N MR24214 (976J498-1 OR 976J598-1), CSD P/N MR24118 (700842AMOD) MFG WESTINGHOUSE/SUNDSTRAND