TC reported rain water seeping thru thedetrainment ramp. ~~~~~ 3556 TC reported rain water seeping thru the detrainment ramp. 3556 found top detrainment ramp water seepage.  3556 detrainment door resealed with insulation sheet (Azmaflex). Water ingress test - OK, no water seepage detected.  Tarmidzi/Hadi/Elfyan 44458