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They come apart by wedging something thin along the bottom edge and getting it started, the cover and base snap together (at least the MB and KAE units I've seen do this).
Look for melting or discoloration at the parts of the circuit board where the big metal relay is soldered to the board, and where the socket pins are mounted. Do not adjust the potentiometers on the board unless you know what you are doing (assuming that you have MB relays).
Some people swear that the KAE units aren't any good, but they are actually of more modern construction and design (contain a microprocessor and no potentiometers and adjustments).
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