求翻译：(1）加压至28a 4 若压力下降 ．MP并维持2h不降压为合格。应给予修正；如果修正后的压力值仍低于加压时的压力，则应查出漏点并予以修补。是什么意思？

(1) pressure to 28A 4 If the pressure drops. 2H not buck MP and maintained is qualified. Amendments should be given if amended, the pressure value is still less than the pressure of the pressure, you should identify and repair leak.