TC reported that there was water leakingfrom leading cab air-con. ~~~~~ 3670 TC reported water leaking from leading cab air-con. 3670 water leaking from right corner .  3670 cab filterreplaced due to dirty. Performed pipe purging - OK, no chokage. Check cab A/c temp. at 25'C, no adjustment required. Check drain pipe from cab A/c evap. unit towards carbody & all insulation sheets - OK. Function test & monitor for 1 hr - OK.  Au TK 43832