Maintanance Crew

In the moment the maintanace production works like magic over WLAN. I think the maintanace could wor like the fuel Station with added trucks for this work. There can vehicels do there maintanace by itself and a crew from trucks can drive to the buildings and make the maintanace on side.
therefore should the maintanace decrease slower.

There could be a bit of an issue with large, very compacted, factory layouts where many buildings would not be accessible to a maintenance crew.

Give them crazy reach then.

I like the idea simply because it increases the visual activity of your factory. And for what it's worth, in a realistic factory, the ability to reach each part in order to do maintenance is important.