Re: Bathroom water "eruption" - any ideas why?
If the water is backing up elsewhere in the house, that indicates that the drain system is unable to evacuate the waste water, at least not at the volume being supplied by the washing machine. This tells me that there is a restriction in the system that wasn't there before, which could be a waste blockage, tree roots, or collapsed line. Before any jack hammering occurs, I'd recommend hiring a plumber with a camera to send it down the lines for inspection. While this service isn't free, it's a darned sight better than needlessly demolishing something that is not the problem. It is possible that all that is necessary is an augering of the lines. Worst case scenario is the exact location of the blockage will be deduced without any unnecessary exploratory surgery which will cost far more to repair.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!