My father is a retired programmer. When I was in high school in the late 1970s, he purchased a TRS-80 model 1 (on which I learned to program in BASIC). At some point in the early 1980s it, together with various accessories, was put in a box and stored in an attic crawlspace for 25+ years. When my parents moved from that house several years ago, my father gave this to me since he knew I was interested in the history of computers.
I would like to refurbish it if possible. But, is it even safe to power it up without first checking the circuitry? The crawlspace was exposed to temperature extremes ranging from near-freezing in the winter to above 100 degrees Fahrenheit in the summer. It hasn't been powered up for maybe 35 years. I'm afraid that if I plug it in and turn it on, a degraded component could cause a short-circuit which will fry the electronics. Is my fear baseless? If not, how would I go about safely refurbishing it?