From memory of that far back.
Those Tantalex caps, I believe are "Wet" tantalum types. Personally, I've not known one to fail, unless grossly over-voltaged!? But there is always a first time.
The black extenders to the push switches can usually be gently persuaded off the switches themselves with a little persuasion from a flat screwdriver blade to spread the gap in the black part, then pulling away from the switch.? Be gentle, at their age, the black plastic might have become brittle.
"Have Fun"...
??? Dave ex Tek UK of that era.
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