Well, it seems the diagnostics are telling you what the problem is. A9 and A6 are most likely ROMs (have not looked at a real TRON coin-op in a long time). At least you know it is the sound board, which is where one would expect to start since that's the only problem.

Helping you fix this problem depends on a couple of things. First, how technical you are (or are willing to become). Second, how willing you are to learn, research, and get dirty. If you don't know anything about electronics, you need to educate yourself a little first, or get a friend who does know some electronics and ideally some digital electronics knowledge.

Also, you absolutely cannot fix a coin-op without a service manual and schematics, so you will need to get your hands on a real or electronic version.

If any ROMs are bad, you will need a EPROM eraser and programmer (two different items), or find someone who has them. I have both and have posted before that I am willing to program EPROMs for anyone on the board, you just pay for shipping both ways. A decent entry level programmer will set you back about $200 or so, which is why most hobbiest don't have them.

You will need a multimeter and logic probe, both of which can be bought at Radio Shack, but personally I prefer a higher end meter (Fluke). If you are really serious about servicing the unit, eventually you will also need an oscilliscope or logic analyzer.

If I get some time, I'll see if I can dig up what A9 and A6 are on the sound board, but you need to try yourself as well.

If all this is beyond what you are wanting or willing to do, you will have to pay to have the game serviced. But keep in mind that these games are 20+ years old and they will only fail more as time goes on. Learning to service them is almost a requirement of ownership, unless you have more money than time and pay someone else to fix it.

Matthew
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If you have a known good set of boards, absolutely swap them out. That is one of the easiest ways to troubleshoot and at least isolate a faulty board. Just make sure you have the same part numbers, then swap each board one at a time and make sure the game works after each swap. One word of caution in doing this, if a power problem caused a board to fail, you might ruin your new board if the problem still exists. Kind of like finding a blown fuse; something caused that fuse to blow and just replacing the fuse usually does not do any good until you correct the problem.

I'd start with the sound board and see if that fixes your problem. If it does, there is no reason to swap anything else, just put the other boards in a safe place until they are needed (or test them as a set right now to ensure they are good, then put them away.)

Once you know the faulty board, you can begin troubleshooting to the component level. The first thing to check is that the ROMs are valid (if the board has ROMs). Also, the diagnostics were reporting what looked like specific chips, so I'd start with those locations.

Matthew