Hi Mike. Fortunately, I've never experienced that disaster to a PC. But I should imagine that in the event of, it'll be more than just the PSU that needs replacing.
Gives the phrase electrostatic discharge (ESD) a rather extended meaning!
And just for the record, etc., attached in the basic cct. for the variable loads. The meter in parallel with the collector load resistor, Rc, in effect is a voltmeter. But since the voltage appearing across Rc will in linear relation to the current through it, that meter can then be calibrated in units of current.
Apart from Rb, the other resistors have values (ohms and watts) dependent on the voltage rail that is being monitored. The two meters are connected to multi-wafer, rotary switches with appropriate resistor values for same reason.
Those power resistors are mounted on a 2 mm. thick steel plate. The from panel is 3 mm. aluminium, as is the rear heat-sink and its cover. The casework is softwood and plywood - mainly from salvage scrap.
Al.