OHHH my god don’t push that............:D:D:D

Got a pic of said switch :)

J
F1FD1121-9B58-4573-B861-C7D027874E53.jpeg
 
It's the vehicle fluid purge switch to initiate fluid leaks if none are present, or to sustain leaks if they are already up and running. (Covers both coolant , lubrication and also external to internal environmental moisture ingress)
nb it's unimportant which position is selected as it will work in either orientation.
 

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