On my search to get off wheel locks
came upon a reference to a
bora scope
http://www.mpt.org/motorweek/goss/20015.shtml
Seems it is a micro camera unit that can look inside the engine wo taking it apart.
If someone had access to it
why couldn;t they go in thru the oil filler hole & look at the chain & guiderails at least to see the color & avoid taking off the valve cover?