AA. 检查所有密封胶围绕着孔。
BB. 移动所有孔周围的密封胶。
CC. 清除所有孔周围的密封胶。
Remove all sealant that is around the hole.
Remove the remaining sealant.
Remove the sealant with a blunt scraper.
Remove the corrosion with the chemical compound that is specified in table 6001.
Remove the detergent with a clean cotton wiper that is moist with water.
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