TC reported air leaking sound on the 'B'side wiper. ~~~~~ To replace wiper tank.  3716 replaced wiper tank inspection glass. Security/function check - OK. No water leakage was found.  Sarma/Anand/Kamarul/Shafie/Sugu 44910 3716 TC reported air leaking sound on the 'B' side wiper. CE : T407(3716) check no air leaking sound on the "B" wiper but a maintenance tag. Water tank isolation cock been isolated.  3716 checked wiper tank with a maintenance tag dated 12/09/2022.    Tightened sight glass securing bolts but water seepage still persisted at the same location. Isolated the water tank v/v & tagged. OPS 20 raised to replace the water tank sight glass.  Irwan/Hanafi 44910