As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CCS - MAIN BATTERY CHARGER EICAS MESSAGE RECEIVED IN FLIGHT. MAIN BATTERY CHARGER AND APU SWAPPED. REPLACED MAIN BATTERY. PLACARDED APU INOP PER MEL. ENTERED MIS SHEET. APU AND BATTERY CHARGER OPS TEST PERFORMED. SYSTEM BACK TO NORMAL. OK FOR SERVICE. REMOVED PLACARD. MEL 49-01 AUTH NR 6-447DC-C. MIS SHEET CLEARED. (M)