THERE WAS NO INSTRUCTION TO CHECK/INSPECT BATTERY CABLES THAT WERE "BURIED" BEHIND R/F WHEEL FENDER WELL AND BELOW ENGINE. WHEN INSPECTED, THEY WERE SO CORRODED, THAT BOTH HAD TO BE REPLACED AT SIGNIFICANT LABOR EXPENSE WHICH WOULD HAVE BEEN NEGATED BY NORMAL PREVENTIVE MAINTENANCE INSTRUCTION PROCEDURES. *NM