This is a late fix. I asked Kari about this problem last week and she confirmed that it was never fixed. I went to have a look and after messing around on the AC and DC sides a bit I still had the same issue with Ileak… I looked at the DC combiner and realised the only other place where the Earth wire came into play was at the bottom of the Surge arrestors… On closer inspection of the surge arrestors it hit me like a hammer. 4 panels in series with a voltage of above 180 VDC, and a DC rating of 180 volt max, the surge arrestors were causing the leak. I disconnected the earth to the Surge arrestors and the I-Leak was gone. @karischoonbee opted to replace the Surge arrestors herself, so i guess she will report back when she has completed the job.