As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED DUE TO ELECTRICAL SURGING WITH INSTRUMENTS AND LIGHTING FLICKERING. ALSO HAD AUTOTHROTTLE DISCONNECT AND SEVERAL PRESSURIZATION SPIKES. WHILE ON APPROACH WE GOT L GEN OFF MSG. REPLACED LEFT GCU IAW AMM. PERFORMED OPERATIONAL CHECK OF LEFT IDG IAW AMM. OPERATIONAL CHECKED NORMAL. ACFT VOLTS AND FREQS CONSTANT.