Counterbound T406 reported T225 one of the headlight not working. TC stepped out at MSL checked and confirmed that 'B' side headlight was not working. ~~~~~ 3678: Counterbound T406 reported one headlight not working. TC stepped out at MSL checked and confirmed that 'B' side headlight was not working.  3678 B/S faulty headlight replaced. Tested operation - OK. Wong/Anand 44378