Without looking at schematics or specifics to the game (sorry if this is quick an stupid) but, whenever I hear 1/2 voltage problems I think of bridge rectifiers and wrong AC/DC settings on the DMM for the test points.
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Re test CR1 and CR2 the 1n5401. They should be 3amp, 100v rectifier diodes. Look for cracked solder joint also. Those will be doing the same thing a bridge would have been doing and an open connection at one of them will cut your voltage in half.
If not, the schematic show plenty of voltages along the way. They are not test points so you'd have to be careful. But you should be able to narrow it down. But you already replaced the usual culprits. The UA723 (IC1) and Q1 are the main ones.
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