Here in the states I received a notice from BMW that the original fix for the EGR Cooler has been superseded. Apparently the fix wasn't a complete fix. So I find it plausible that your fix has failed.
The parts aren't available yet for me to have mine done yet. I'll check with the dealer later this month. Luckily, in my case there hasn't been a leak yet. I had a leak before the last fix 2 years ago (when I had asked about it, I was told it was normal. Obviously it wasn't). But my leak at the time was smaller than yours.
Have it checked. There are other possibilities, like cracked plastic, etc.
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