TT, sorry to hear about the drain hassles. Whoever had the brilliant idea of installing pipes before pouring the slab should be drawn and quartered. Anyway, even though replacing the line makes a mess, it's not so terrible. Jackhammer out the old, drop in the new, pour new concrete. I was fortunate to discover that my drain needed replacing during a renovation of my 75 year-old termite trap. Hopefully you won't have to bother...
