525/526 air leak rate fail - 1bar/5mins, ~~~~~ #1526 found brake frame double check valve leak, c/o done. #2526 strainer check valve leak, c/o seal kit-ok. CR pipe joint leak, tighten-ok. #2525 brake underframe brake testpoint leak, c/o okay. #1525 brake frame test point leak-c/o ok. Air leak test 0.4b/5mins. Cut in - 8.9b abd cut out - 10.4b. Charging time 2min 25sec Done by: Sanip and Koh  Replace ACU #2526 due to hunting at E/M. New s/n: 1038062 Old s/n: 1240095 Notification no: 2575137 Further check found 2526 B-side CR pipe joint air leak - tightened. To further improve air leak rate.