As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCO/ORF - FLT 640 - AT FL 330, DISCONNECTED NR 1 GENERATOR DUE TO UNDER VOLTAGE. ATTEMPTED TO START APU WITH NO RESPONSE. A DIVERSION WAS MADE INTO JAX. MECHANICS TROUBLESHOT SYSTEM AND SERVICED NR 1 CSD. POST-MAINTENANCE ENGINE RUN REVEALED NO PROBLEMS WITH NR 1 GENERATOR. MECHANICS RESET OVERPSPEED BUTTON ON M-280 MODULE AND RAN APU. RELEASED AIRCRAFT FOR SERVICE.