Default USB slot replacement

My fine is not charging properly.sometime it charges or sometime it's not .even I have kept charging on ,battery get I went to Samsung service center they thinks it's usbslot I have to change it but they said CHANGING USB SLOT IS RISKY IF ANYTHING GOES WRONG then it will damage motherboard. Please can any one tell me , does any one repair/replace their usbslot from Samsung service center (fone is not under warranty)
PRIMARY : crDroid ||SECONDARY : Purelook|| KERNEL : Googy-Max