thanks Nino, the plug etc has been replaced not long ago and looks fine. I'll run this passed you though. The burn looks like the type that is caused by a back connection ie the fuse holder. I alo asked a sparky today who was looing at a job for me and he's thinking the same. If this is a possibility IYO or anyone elses, I thnking to solder a bridging wire from the burnt fuse pin to J115 to possibly aid in 1. the connection and 2. take some of the amperage/heat from the track that my be weakened.

Is my thinking correct or not? What would cause the fuse to basically melt inside and keep working as opposed to blow. Is it voltage or amps that does this?

Thanks and I wait until I hear from someone before soldering.