How did you diagnose? CCTV?
9" angle grinder, lump hammer & bolster, and various digging things.
It wouldn't have been possible to get any cameras into the drain, as it was all ceramic & cemented in place (including the grill / cover).
I'd still have dug it up in any case - It's the only way you'll get to really see what is going on.
as it was all ceramic & cemented in place (including the grill / cover).
Because life is not hard enough
Fuck knows what the ceramic stuff is made off too - cutting through it makes plenty of silicate dust. But also sparks. And something melty.
@Howard started
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9" angle grinder, lump hammer & bolster, and various digging things.
It wouldn't have been possible to get any cameras into the drain, as it was all ceramic & cemented in place (including the grill / cover).
I'd still have dug it up in any case - It's the only way you'll get to really see what is going on.