The touch screen "claimed" to be original is actually just an aftermarket device just like others, it is not officially from Peugeot.
You can simply source from the market at your own sweet time.

Changing the audio system does and/ or doesn't affect warranty is still up to the Naza decision, unless the SA can provide black and white to support on his statement that Peugeot/ Naza won't void the warranty.

There is a continuous input from the temperature sensor to the ECU, throughout engine operation. ECU uses this input to command appropriate fuel strategy. Hence it is critical the temperature has to be 90 deg, not less not more. 90 deg is the optimum operating temperature.

Air density is higher during cold mornings. This would require a slightly richer  fuel ratio. Due to improper temperature inputs the ECU has not been able to adjust the right fuel ratio. Therefore sluggish or difficult start up.

Your over boil coolant temperature is also due to wrong feedback signal from coolant temp. sensor. Every time a 70deg temp. signal feedback is received, ECU commands the engine to increase temp to 90deg. Continuous high temp. commands leads to over boil condition.

One U sales. 408 only 86,888.00

Value buy?