I think TRM nailed it both times, sorry to say. I recall no mass 'defective carts' issues. And while I did get a cart replaced once (it was a prefilled one that actually didn't have one of the two heaters ever installed!!) it was 'replaced' (I actually got credit which I turned into drugs on the spot) they are specifically not guaranteed. If you go check the PV site you'll note this. They say they're selling you a box of five at the 'price for four', the extra being exactly for this reason (the rare one might be defective). As you know, bad carts are actually pretty rare.
More over, a leaking cart is not really considered defective. It happens a lot, which is, of course, what is driving all the efforts THC is going through trying to make a leakproof cart. Folks have noticed some leak long ago. This is almost always due to the concentrate used or bad heat control in loading.
As consumers we've agreed to assume the risk for a bad cart (if indeed the leaker was that way to start) and assume responsibility for what we put in it and how.
I'm sorry to advise, but I 'don't think you have a case' here. Not that THC or PV might put on their well known white hats and send you replacements, but I don't think it's a warranty issue requiring return. Otherwise THC has a storefront now I think, I'm sure if you went by they'd be happy to sell you a few of the very best carts they know (FWIW).
The key, I think, has to be to get up and running again. Even if it costs you a bit of money for a few carts it will get you in a position to medicate as needed. As you know, the system is a sterling performer in that area, IMO well worth the effort.
Good luck.
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