What was found
BATTERY DISCHARGE ILLUMINATED SEVERAL TIMES STAYED ON FOR APPROX 2 MIN LAST DURATION THEN EXTINGUISHED. EPCU FAULT REVIEW SHOWED "COOLING VALVE 3/ INTFC", BATTERY CHARGER FAULT DISPLAY SHOWED "CHARGER FAIL, BATT FAIL, BUSS OK". TROUBLE SHOT IAW MM 24-30-00-2, CHECKED WIRES AND PINS FROM CHARGER TO BATTERYS ALL CHECKS NORMAL. FOUND SOME CORROSION AT BATTERY GROUND 4027R, CLEANED IAW SMP, REPLACED BATTERY 1 AND 2 IAW MM 24-34-02-4, AND BATTERY CHARGER IAW MM 24-30-00-2. ALL TESTS PASSED, OK FOR SERVICE.