on the bench...
https://imgur.com/adDUoEM
this was AFTER spraying the top side down with a bottle of 50/50 water and isopropyl alcohol, it got a lot of the dirt off, still cruddy looking though, but no where near as bad.
bottom.
https://imgur.com/oFR1Zab
SOOOO many paper time bombs under there
and OHHHH!
a cryptic message from some old repair!
https://imgur.com/7D4DOR8