hi im new to this site but im having problems with my barcrest mpu6 first it said flat battery so i replaced the battery on the main board and done a ram test and it passed but its saying error 52-36 someone did say its to do with the battery at the top of the machine ive found a battety covered in heat shrink which says is an I button I was told check it had,nt come loose but has,nt now im stuck if anyone can help would be great thanks