I'm always suspect of the the surface mount electrolytic capacitors in these vintage units -- especially if they haven't been used for a long time (years).
Also, voltage regulators can get hot. With time and use the solder connection can get unstable and even break. This situation happens because the of the expansion and contraction of the connections due to heat and subsequent cooling down of the regulator.
The break may not visually apparent. With *any* vintage solid state equipment, a "touch-up" of the voltage regulator connections would be good preventative maintainence.
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