1641 DT CHECK FOUND BRAKE PRESSSURE FAIL ~~~~~ 1641 DT CHECK FOUND BRAKE PRESSSURE FAILED.  641/642 swapped the following : 1) #1641 BCU (S/N:1446-066) with #2641 (S/N:15-41-279) 2) #1641 ACU (S/N:1523/114) with #2642 (S/N:1434/020) 3) #1641 transmitter with #1642. After swapping, found #1642 transmitter faulty. Replaced #1642 transmitter. Function check - OK.  Kamarul/Lee PT 44778