Also to worry about:
* Paper rot (paper documents that are crumbling due to acid in the
paper)
* Bit rot (EPROMS or magnetic media that are
nearing their
theoretical
lifespan)
I was going to mention that.
Also electrolytic capacitors that need reformed.
Old oil/grease in fan bearings and the like, which has turned to
varnish/wax and seized the bearings.
If it hasn't been mentioned yet, rubber
rollers inside tape drives, paper
tape and punch card readers and punches...basically rubber rollers in
anything mechanical.
Didn't Philip K. Dick recommend Ubik ?