Thanks both. Sorry for lack of detail.
Looking for the most pragmatic option here, although demolition tempting…
Pic 1 from a few weeks back after heavy rain. Drains away but waterlogged area is the high point with pipe falling away.
Pic 2 from heatwave in summer when everyone’s grass died but we still had lush grass lines following the pipes.
Pic 3 to show the clay at level of pipe. No obvious fault on connectors with dye testing etc.
Other than areas tracking the two pipes, the lawn is ok and no water logging etc.
Accepting the lawn needs replacing with free draining soil and that this needs to go down to the level of the pipework, could it work to replace only the pipe channels rather than the entire lawn?
Many thanks. Appreciated.