had a fire due to 'leaky' CPU block, Buy a new CPU block?

Hey Guys, was on my phone whilst my PC rebooted after a registry edit and heard what sounded like a plastic bag rusteling outside.

as I look up I see (with utter panic) thick smoke pouring out of my case. My GPU's 16x slot seemed to cause a short and catch fire incinerating 5 of the traces...

After some investigating it looks like the rubber seal around my EK CPU block was degrading and after 6 months since i cleaned it was enough for it to 'leak' this... oil like substance rather than coolant.

My GPU is fried (RIP old friend) and I was still on a 2600K so I was looking to upgrade in several months anyway. Should I;

1. Buy a new block 2. Buy a new o-ring 3. Re-seat the o-ring.

For the sake of not frying my new equipment, $100 isn't much but if its literally moot then it's extra $$