What was found
FOUND MAIN BATTERY DEAD. FURTHER INSPECTION REVEALED BATTERY HAD APPARENTLY FROZE AT ONE POINT IN TIME, AS BATTERY CASE WAS BULGING IN THE VICINITY OF THE RT MONOBLOCK AND UPPER CELL CAP HAD POPPED OFF. OVER TIME, ACID HAD EATEN THROUGH BATTERY CASE FORWARD, RT LOWER CORNER, ALLOWING BATTERY ACID TO SEEP ONTO ACFT STRUCTURE. REMOVED MAIN BATTERY, REMOVED BATTERY ACID (NEUTRALIZED) BY THOROUGHLY CLEANING CONTAMINATED AREA UNDER BATTERY BOX AND UNDER BAGGAGE COMPARTMENT PANEL FRAMEWORK, FUSELAGE SKIN, AND STRINGERS IAW MFG CORROSION CONTROL MANUAL CHAP 9. R & R ELEVATOR CABLES WITH NEW IAW MM 27-30-00, OPS CHECKS NORMAL. R & R RUDDER CABLES IAW MM 27-20-00, OPS CHECKS NORMAL. INSTALLED NEW BATTERY IAW MM 24-32-00, OPS CHECKS NORMAL. ACFT RETURNED TO SERVICE.