74LS139 getting cooked.
This is a BlackOut game, with the MPU looking like it's had some work in the past (sockets, excess resin, cuts on the solder side from some sloppy solders I've cleared up). I've cleanly resocketed and resoldered this chip, in the "Address decoder" region of the MPU on this Williams System 6 MPU for the game BlackOut. The jumper J3 is wired with a 0 Ohm resistor, J3 is not connected. Looks like a pin is bridged on the solder side (connected in the data buss section in D4-D8 on pins 12 and 14 on chip ECG6889/P 312 185617KK) and the solder side pin 16's solder pad is gone. Does not look like any traces were connected to it.
Overall the board is not bad after I pulled off the old solder, reflowed new 60/40 rosin core solder on the main interconnect and anything else I saw that was off.
I would like some direction from those more knowledgable than I to narrow down the search. Thanks in advance.