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I'd replace both thermostats just for peace of mind, the pair are about £70 from bmw, the egr thermostat is very easy to change only took me 20 minutes, the main thermostat took about 1/12 to 2 hours as you will have to drain some the coolant out, the bolts are a bit fiddily due to the location but not that difficult if your handy with the spanners!
If it helps I'm sure i've seen a recent write up on changing the main thermostat.
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