653/654 Both DT car air leak underframe ~~~~~ 653/654 Both DT car air leak underframe     Found #3653 Air compressor delivery pipe loose,tightened and function checked ok. Found #3654 Air compressor safety v/v blown when air is charging and air dryer purse 1 time with air leaking continuously from dryer.Suspect air dryer choke. 0020 raise to follow up Checked by Loong. 21/03/20 To follow up 0010 To check and rectify compressor safety valve blow when dryer change over. #3654-Replaced air dryer and function test ok. Old s/n: 015-12780  New s/n: 015-13878 Not: 2143408 raise. Done by Samsudin/Gopal/Deeshan.  22/03/20