Worse than dead? sound serious..... :-)
Sounds like you have a bad connection in the main feed wire/connectors/fuse block. It's a common thing on high current connections with wig wires for them to get a bit loose and then start heating - most likely all you have to do is fix up the connections to make them clean and tight and you'll be sorted.
Do it properly though (not cable ties!) and spend an hour or 2 taking bit off to get to all of the appropriate area. Get photos of things before you pull them apart and then find the bad connection(s) and fix.
Not past DIY, and you'll go

when you fix it yourself for minimal cost!
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