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Not sure if i would just jump to the conclusion that a head gasket went bad -- you said:
"...for some reason the coolant reserve was full and spilling out warm antifreeze which should of been green but was brown..."
what "kind" of brown was it? dark? light? -- I know you just said you did a flush, but you may of needed to do a chemical flush as well, because you have rust in your system. What it also could be is that there may be a blockage somewhere and that is why your coolant reserve tank was overflowing...nowhere for the coolant to go but into the reserve...
I would just check over the silly things first like drain the oil and make sure nothing major happened and then from there check that your thermostat isn't sticking etc.
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