So you had 1.4 Meg ohm, did you fail it or take it out of service. Sometimes removing any aerial/service connections can clear IR issues. Bit confused over the kettle lead, kettle leads are normally different to IEC connectors, a kettle lead or hot connector as they can be known as will fit an IEC connectors but an IEC connector should not fit a kettle as the kettle connection has a key way. If it had an IEC connection the TV may well be class I.