Clear oily liquid leaking from under kitchen cabinet

Given that the leak appears to be coming from the area of the converter behind the breakers, start by inspecting all the connections around the converter and breaker panel. Look for any signs of loose fittings, cracked hoses, or damaged seals that might be causing the leak. It sounds obvoius but it could be the case. In case my advice won't work feel free to contact https://www.emop.co.uk/.