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I'm not sure any of it actually was the builder to be honest.
The biggest issue was the damaged elbow underground - he didn't touch that. The T may have been installed by him or a different guy who came to check our drains last year when we thought we had a smell and rat problem. He came to check on it a couple of days after I posted on here and was really nice about it - he's a decent guy.
I think we're just going to draw a line under everything now and wait for the next big expense.
Glad you found the problems and got it sorted. Are you going to look to reclaim costs from the builder or put it down to experience?