I have been told 3 of 8 freeze plugs are leaking and all 8 should be replaced? After being told how much they would charge me, the shop tells me it is more work than they thought and it was gonna be more $. It makes me worry if this is somewhere that has done something like this before or not. Originally they said there were 6 plugs, now 8. Can you give me a lil more info about the repair.