I learnt how to replace mine on a u tube tutorial. I can't link it as am on my phone but type it into utube to see if its something you could perhaps do yourself. (Its realy easy
Also, just a thought but is your lo's poppered vest on too tight? Or aree they wearing snug fitting leggings/trousers ect? As that can cause compression wicking or leaks. Perhaps try bigger vests or get some vest extenders (they are brilliant) also just another thought...you know the poppers that make the nappy bigger or smaller in the rise (length) what setting are they on? Could it be that you need to adjust and tweak the rise? Only asking about this as a lady on here was having leak problems with bg and she adjusted the rise and it solved the problem. Hope you get it sorted.