@happy08 , best is to change all those detacthable parts like the Tubing, funnel, shells etc. i bought locally online from kulily.com. Mums and babes, kiddy palace,etc also selling, or u can go to the medela service centre ard toh guan area, and they can advise u on the size to buy, so u wont get too small or large shells. (When express the nipples will rub against it, can cause bleeding, or too big the milk may not flow..) u can also bring ur motor down if got warranty to check if still in gd condition, or if the motor is weak, if no warranty den best to call n check if got any fee for checking. I know if need replacement or servicing den need pay at LEAST $60 wor. Buying the parts in US is even cheaper if got friend/relative gg there.sometimes online have spree for medela or other brands also.