Counterbound TC T434 on the NB reportedT444 'B' side headlight faulty. T444 TC step out at YCK SB t o check and confirmed headlight faulty. ~~~~~ 3643 Counterbound TC reported 'B' side headlight faulty. 3643 TC step out at YCK SB confirmed headlight faulty.  3643 B/S headlight replaced with new headlight (150W). Security/function check - OK.  Daniel/Redzwan 45470