I would guess maybe a terminal came off the inside banana plug connector inside the transformer. unless you know what you are doing I would not suggest you take it apart yourself the internals can easily be damaged if you don't know what your doing and the circuit boards can be quite expensive and mth will not sell them to you anyway.
the one thing I would suggest is check to see if your circuit breaker is tripped and if tripped reset it ok!
Alan
p.s. the circuit breaker are behind the left and right back side of the transformer behind the control handles ok
p.s send me an email if you need help I live in new jersey as well near the shore