They weren't that big on guarding and labeling hazards. All the red and white wiring has AC line voltage on it. They guarded the contacts of the circuit breaker in the upper center/right but not the terminals on the input AC sockets or the filter capacitor below the breaker which are live when the breaker is off. The hour meter terminals to the left of the breaker are live when the computer is on. Watch out when fishing for the item you dropped.
Feel free to contact me, David Gesswein email@example.com
with any questions, comments on the web site, or if you have related equipment,
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interested in anything PDP-8
related, computers, peripherals used with them, DEC or third party, or