What was found
"ELEC" LIGHT ILLUMINATED ON OVERHEAD ELECTRICAL PANEL ACCOMPLANIED BY LIGHT ACRID SMELL IN FLIGHT DECK. GROUNDED - YES. R&R MAIN BATTERY CHARGER REF B737-800 AMM 2-31-21, AUX BATTERY CHARGER REF AMM 24-31-31, MAIN AND AUX BATTERIES REF AMM 24-31-11. ACCOMPLISHED CONDITIONAL INSPECTION 05-51-56. ACCOMPLISHED GVI OF BATTERY CHARGERS AND BATTERY CABLES. REF SWPM 20-10-06. NO DEFECTS NOTED. ALTERNATE DEACTIVATION PROCEDURE USED PER CHPT. 5, TABLE 3, ITEM 1DURING R&R OF AUX BATTERY CHARGER, FOUND SOOT UNDER CHARGER AND ON MOUNT, AND THIS IS WHERE THE ODOR CAME FROM. ELEC LIGHT EXTINGUISHED ON OVERHEAD PANEL AND DID NOT ILLUMINATE AFTER R&R.