I think you've got your order wrong way round - its a lot easier to remove the heat exchanger (located on the top of the engine), have it pressure tested and, if its OK, move on to the heads and coolant plugs.
If you use the search function theres enough reading to cure insomnia......
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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