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I also tweaked the heat-sinks on my DC console, although this is an operation I don't recommend people do unless they're very confident in disassembling and reassembling complex electronics.
The top shield that covers the main circuit board has a heavy aluminum heat-sink riveted to it. This heat sink may not be obvious at first glance, but it has metal tabs that are bent down a bit from the rest of the metal. These tabs make contact with the large chips on the circuit board (the chips have soft rubber thermal material on them).
To me, these tabs didn't look like they fully touched the chips, so I very VERY carefully bent them slightly so they would press against the chips a bit more firmly. DO NOT OVERBEND! TO MUCH PRESSURE ON THE CHIPS COULD BREAK THEM OR THEIR SOLDER JOINTS!!
After reassembly, test to make sure it works. If not, disassemble and try to find your assembly mistake.
Note: I've torn down and reassembled my Dreamcast down to the main board several times and it worked fine after each reassembly. I have, however, also build components for expensive avionics RADAR and FLIR systems before, so... ...your abilities may vary.
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