Is the leak at a glued (excuse me..solvent welded..fitting)?
I've had some pretty good luck with splitting fittings by sawing through the fitting to the pipe in 3 or more places, then sticking a screwdriver in the void left by the saw kerf and twisting until something breaks. It's usually the fitting, but not always. Be sure to buy a couple of extra coups.
Whittle and sand the living heck out of it and use Christie's Hot Blue Glue.
(After all, I'm just a plumber masquerading as an electrician anyhow [Linked Image])
I have a real nasty habit of breaking plumbing every time I stick a shovel in the ground,..and the backcharges are just terrible...S