Last night while playing Mustang I noticed that lights in Column 4 and 5 light together....example in test light 12 lights both 12 & 13, 13 lights both 13 and 12, same for 20/21, 28/29, 36/37, 44/45, 52/53, 60/61, 68/69, and 76( not used ) and 77. They are not on all the time like it is shorted transistor - I really don't see how they are tied together - a bad diode on one of the light sockets? What am I missing??