As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED "ON CLIMB OUT LEFT GENERATOR CAME OFF LINE FOLLOWED BY RIGHT GENERATOR. AC POWER LOST MOMENTARY. CYCLED BOTH GENERATORS. BOTH CAME BACK ON." CREW ELECTED TO RETURN TO PHX. LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE COULD NOT DUPLICATE DISCREPANCY. REMOVED AND REPLACED THE NR 1 ENGINE GENERATOR BREAKER, C801, AND THE NR 2 ENGINE GENERATOR BREAKER, C802, IAW AMWEST TASKCARD A8M24002. OPS CHECKS GOOD. VENDOR CONFIRMED FAILURE ON BOTH BUS TIE BREAKERS THAT WERE REPLACED.