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MANTENIMIENTO PREVENTIVO- ITEMS 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7,1.8, 1.9, 1.10, 1.11, 1.12,1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.20, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.28,1.29, 1.30, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.7, 1.27, 3.1, 3.2, 3.3, 3.4,3.5, 3.7, 3.6.