TC on counterbound train (T346) reportedthat T339 'A' side headlight was not working. TC of T339 st epped out at DVR1 and confirmed. No headlight fault indicati on. ~~~~~ 3651 TC on counterbound train (T346) reported that T339 'A' side headlight was not working. TC of T339 stepped out at DVR1 and confirmed. No headlight fault indication.  3651 A/S headlight replaced. Security/function check - OK.  Kana 44264