As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CHECK, NOTED THE CIRCUIT BREAKER TRIPPED. THE CIRCUIT BREAKER LOCATED ON P18-3 PANEL IS FOR THE EMERGENCY CHARGER FOR LIGHTING LEFT AFT. REMOVED AND REPLACED THE POWER SUPPLY M1670 IAW AMM 33-57-06, AND WDM 33-51-11. OPS CHECKED GOOD IAW AMM 33-51-00.