Excepting the case where they arrived in insecure baggage, snakes that show up in machinery are generally on the trail of rodents or bird nests.
Rodent urine is corrosive and there is also the possibility of hantavirus in some regions.
They also use fiber insulation or seat stuffing for nesting and chew insulation off wires
I've heard that Greeks and the Pueblo indians generally welcomed snakes around the house for rodent control.
One of my son's snakes sometimes disappeared between the walls for several weeks at a time. When I dismantled my upper kitchen I discovered a rodent apartment complex behind the valence above the wall cabinets. She liked to catch her own food
