Sounds like a plan !! Have you replaced a flush valve before ,new donut washer required etc ,etc. ?
Chances are that the stack is leaking due to expansion & contraction and no method employed for dealing with this.
Solvent weld joints can sheer if this movement is great enough and not accounted for.
More so when not properly made.
One would hope that a pressure test was completed on the installation, in order to be passed by BC at the time of construction.
As we all know what is on paper on the rules and what happens on a site are very different. Its a case of getting it done as quickly and as cheaply as possible with very little care
Not disputing that the stack shouldn't leak, but it wouldn't have been noticed until there was water sitting in the stack.
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