What was found
AFTER ENGINE START, ELECRICAL LIGHT ILLUMINATED. ACFT GROUNDED. AUX BATTERY CHARGER INOPERATIVE, FAULT ON PANEL. AUX BATTERY CHARGER BATTERY LED INDICATION IS DARK. REMOVED AUX BATTERY CHARGER REF 24-31-31-000-801, INSTALLED AUX BATTERY CHARGER. BATTERY LED IND IS VERY BRIGHT . REF MM 24-31-31-400-801. PERFORMED BITE PROCEDURE AND CLEARED ALL FAULTS. REF MM 24-31-00-810-801. ACCOMPLISHED BATTERY CHARGER TEST. OPS GOOD. REF MM 24-31-31-710-801. R & R MAIN BATTERY REF 24-31-11-400-802-002, OPS CK NORMAL. SPCU NORMAL. R & R AUX BATTERY IAW MM 24-31-11-400-802. OPS NORMAL ON AUX BATTERY SPCU NORMAL.