It looks like it was left out in the elements for a while. That looks like the work of mud daubers to me
which are notorious for plugging up orifices on pitot tubes on aircraft and any other crevice they can wreak havoc on.
I can't see any serious damage in the photos particularly but a good cleaning and inspection is in order.
The tubes for the motor feed could easily be plugged up and needing your attention.
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Mud daubers are a wasp of solitary nature and they kill a spider and lay en egg it and then cover it
with mud. Over time the egg hatches out into another adult mud dauber.
I would go over the machine carefully and look for evidence of mud anywhere. It doesn't have to
be be a lot of mud either as they could easily get into potentiometers or other electronics do their work.
Tubes plugged by mud daubers can generally be cleaned out by running a wire or similar through the
tube a few times to dislodge the mud and the developing egg or pupa.
Edit: Just in case you are worrying that you could get stung while doing your cleaning, there is
nothing to worry about since there will be no adult wasps in that dried mud.