Hye everyone! An unknown thick-and-sticky green liquid was found leaked from 2 out of 9 feeders, of our 132 kV Switchgear. The liquid was leaked through the cable gland that connected to the Secondary Terminal Board insulating cap of the Current Transformer, at the GIS. I had done: 1) gas leak test - no gas leakage detected 2) hotspot test using thermography camera - no hotspot. According to our chargeman, around 6-7 years ago, there is a case when they found out that inside the CT secondary terminal board, there was cracks. And all CT secondary board for all feeders was then replaced. I just wondered if the same thing happened. Or the green liquid was just a kind of grease or softener for the cable. Hopefully someone can help me. Thank you!!!