Davey i am sorry to say but there is only one propper fix , i dig them all for Miller plumbing all over barrie each year , resposability is yours from the house to the side walk the city will quick to tell you , its theirs from the side walk to the main , What i always find when i dig is the old pipes are starting to collapse or have become ovel , the good news is there is a part of barrie where the city approve a certain kind of pipe to be used years back and if when we dig and find this pipe the city will foot the entire expence for the replacement . When it becomes ovel its just about impossible to put the roture thru them . Sorry Davey .