As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT, FOUND BATTERY CHARGER C/B POPPED. RESET AND RAN EMERGENCY POWER CHECK. FOUND BATTERY CHARGER C/B RE-POPPED. T/S PER WDM FOUND A AND C PHASE WIRES FROM C/B TO CHARGER BOTH MOUNTED ON C PHASE LUG. REWIRED C/B PER WDM. REPLACED BATTERIES AND CHARGER AND C/B. ALL REST PER M/M NML. OK FOR SERVICE.